Fred Prince

US Patent 11174182 System for preventing and controlling heavy metals and method for preventing and controlling heavy metals using the same

US Patent 11174184 Method and device for controlling pollutants in basin water used for irrigating farmland in extremely water-scarce areas

US Patent 11174652 Bi-directional leaf rake

US Patent 11180394 Optimally-controlled hybrid phytoremediation system

US Patent 11180395 Horizontal-flow sand filtration pool and water treatment process thereof

US Patent 7374671 Leaf and debris catcher

US Patent 7374682 Method and apparatus for the methane fermentation treatment of wastewater containing sulfur compound

US Patent 7381326 Mega flow system

US Patent 7384544 Canister filter for swimming pool

US Patent 7384553 Method for operating anaerobic ammonium oxidation vessel and anaerobic ammonium oxidation equipment

US Patent 7387729 Filter cartridge for a standalone point of use water purification device

US Patent 7387733 System and method for processing organic waste material

US Patent 7390401 Pool skimmer seal assembly

US Patent 7393452 Compositions and methods for the treatment of wastewater and other waste

US Patent 7395935 Filtering device

US Patent 7396456 Cruising aeration apparatus and method

US Patent 7396457 Apparatus and method for recovering acetic acid and catalyst in process for preparation of 2,6-naphthalenedicarboxylic acid

US Patent 7399407 Pressure filter for aquariology

US Patent 7402242 Swimming pool debris removing skimmer

US Patent 7402247 System for wastewater treatment and digestion having aerobic and anaerobic treatment zones

US Patent 7407580 System and method for treating carbon, nitrogen, phosphorous containing wastewater

US Patent 7410583 Process of treating organic waste for anaerobic digestion

US Patent 7410584 Methods and apparatus for treating wastewater employing a high rate clarifier and a membrane

US Patent 7413651 Pool skimmer guard assembly

US Patent 7413654 Wastewater treatment control

US Patent 7416659 Filter apparatus with fluid bypass

US Patent 7416663 Replacement filter cartridge assembly having an internal lock ring

US Patent 7416669 Biological nutrient removal process and process control system for same

US Patent 7419590 Activity enhanced dispensers

US Patent 7422681 Substrate treating apparatus

US Patent 7425264 Centrifugal screen

US Patent 7425274 Aquarium filter unit

US Patent 7427354 Degradation treatment process and system for organics in organically-polluted water

US Patent 7427357 Process and apparatus for anaerobic treatment of sulfur compound-containing wastewater

US Patent 7429321 Aquarium filter cartridge and filtration system

US Patent 7429328 Apparatus and methods for control of waste treatment processes

US Patent 7431848 Modular ultraviolet sterilizer

US Patent 7435349 System for treating wastewater containing organic compounds

US Patent 7445706 Protein skimmer

US Patent 7445713 Method and facility for treating sludges

US Patent 7452460 Leaf and debris catcher

US Patent 7452465 Incubation treatment of sludge for pathogen reduction prior to digestion

US Patent 7452466 Method and apparatus for anaerobic digestion of biomasses and generation of biogas

US Patent 7452467 Induced sludge bed anaerobic reactor

US Patent 7455765 Wastewater treatment system and method

US Patent 7455767 Debris gathering device for swimming pools

US Patent 7462284 Dissimilatory sulfate reduction as a process to promote denitrification in marine recirculating aquaculture systems

US Patent 7468133 Heated baffle anaerobic lagoon digester

US Patent 7470362 In line wetland water treatment system and method

US Patent 7481933 Process to improve the efficiency of a membrane filter activated sludge system

US Patent 7485220 Water skimmer

US Patent 7485228 Reactor and method for anaerobic wastewater treatment

US Patent 7485229 Closed sulfur circulation system

US Patent 7485230 Integrated cogeneration wastewater sewage and waste polar fats/ oils/ greases/waxes (FOG) waste treatment method and facility

US Patent 7487876 Particles with silver carried and producing method thereof

US Patent 7488415 Disposable salt chlorine generator

US Patent 7488416 Bathing pool assembly with water full of nano-scale ozone bubbles for rehabilitation

US Patent 7488417 Aquarium filter assembly

US Patent 7491323 Water distributor device for aquariums, ponds and the like provided with a possible biological filter

US Patent 7497947 Devices for water treatment

US Patent 7504027 Remote control pool skimmer

US Patent 7504035 Treatment of putrescrible cakes

US Patent 7507332 Swimming pool cleaner debris container

US Patent 7510086 Sealing arrangement

US Patent 7510651 Multi-functional pool floating device

US Patent 7510655 Process to improve the efficiency of a membrane filter activated sludge system

US Patent 7513997 Recirculating wastewater evapotranspiration and disinfection system

US Patent 11185059 Purification method for water, purification device for water, and use of said purification device at low water temperature

US Patent 11186506 Subsurface flow constructed wetland and method of using the same for wastewater treatment

US Patent 11186507 Algal harvesting and water filtration

US Patent 7520990 Anaerobic wastewater treatment system and method

US Patent 7524419 Mixer for use with media in wastewater treatment

US Patent 7527729 Aquarium

US Patent 7527730 Water filtration system and its use

US Patent 7527734 Rapid non-equilibrium decompression of microorganism-containing waste streams

US Patent 7531092 Pump

US Patent 7534350 Liquid medium treatment method and device

US Patent 7537691 Pool cleaning apparatus

US Patent 7537692 Self-cleaning aquarium and associated method

US Patent 7537698 Process and equipment for treating ammonium containing liquid

US Patent 7537706 Microporous diffusion apparatus

US Patent 7540959 Process and equipment for treating ammonium containing liquid

US Patent 7540961 Methods for manufacturing hydrogen using anaerobic digestion

US Patent 7544286 Method and apparatus for enhancing aquatic environments

US Patent 7544290 Aquarium

US Patent 7544297 Filtration device of water pump

US Patent 7544299 Biological nutrient removal process and process control for same

US Patent 7547394 Wastewater treatment with aerobic granules

US Patent 7550078 Skimmer cover and helical ramp apparatus

US Patent 7550082 Process and equipment for treating ammonium containing liquid

US Patent 7550083 Process and equipment for treating ammonium containing liquid

US Patent 7550086 Advanced treatment method of ethanolamine-wastewater based on physico-chemical and biological coupling process

US Patent 7550087 Apparatus and method for treating FGD blowdown or similar liquids

US Patent 7553411 Filter cartridge

US Patent 7553425 Screen for swimming pool skimmer and method of using same

US Patent 7556735 Plant biomass management system and method

US Patent 7556737 Anaerobic phased solids digester for biogas production from organic solid wastes

US Patent 7560026 Two-stage anaerobic digester

US Patent 7563365 Adjustable skimmer safety system

US Patent 7563371 Tubular anaerobic digester

US Patent 7569139 Aquarium filter assembly and filter element

US Patent 7569146 By-products from fermentation still bottoms

US Patent 7572367 Liquid filtration device

US Patent 7575679 Process and equipment for treating ammonium containing liquid

US Patent 7575683 Portable wetlands

US Patent 7575684 Waste water treatment apparatus and waste water treatment method

US Patent 7578397 Device for the treatment of fluids

US Patent 7578933 Biological filter for aquatic ecosystems

US Patent 7585413 Method and apparatus for treating animal waste and wastewater

US Patent 7594997 Portable skimmer, motor and pump protector for a swimming pool or hot tub

US Patent 7594998 Aquarium filter assembly and filter element

US Patent 7601258 Aquarium filter water return chamber

US Patent 7601259 Aquarium filter

US Patent 7604734 Water filtration system

US Patent 7604740 Waste activated sludge stripping to remove internal phosphorus

US Patent 7604742 Soil conditioning products from organic waste

US Patent 7604744 System and method for processing organic waste material

US Patent 7615154 Loop reactor with clog-resistant gas distribution

US Patent 7615155 Methods for removal of non-digestible matter from an upflow anaerobic digester

US Patent 7618533 Filter system for an automobile engine

US Patent 7618534 Aquarium filter

US Patent 7625486 Devices for water treatment

US Patent 7625489 Methods of treating water using devices for water treatment

US Patent 7628913 Aquarium filter cartridge and filtration system

US Patent 7632402 Control system

US Patent 7632407 Rapid proliferation of aquatic plant growth facilitation system and associated methods

US Patent 7638044 Aquarium filter housing with rounded bottom

US Patent 7638054 Periphyton filtration systems and associated methods

US Patent 7641791 Control system

US Patent 7641796 Anaerobic digestion process for low-solid waste

US Patent 7641803 Filter cartridges for fluid intake systems

US Patent 7645380 Microporous diffusion apparatus

US Patent 7645385 Method and arrangement for processing nitrogen-concentrated effluents in a sequential fractionated cycle biological reactor

US Patent 7651609 Filter with self-positioning cartridge arrangement

US Patent 7651610 Water aerating and dirt collecting assembly for aquarium

US Patent 7658842 Filter cartridge assembly with water collection

US Patent 7662279 Filtering device, in particular for fish basins

US Patent 7670484 Filter cartridge construction with carbon profile

US Patent 7674378 Wetland water treatment system

US Patent 7674379 Wastewater treatment system with simultaneous separation of phosphorus and manure solids

US Patent 7674380 Apparatus for treating sewage using a semi-batch process and associated method

US Patent 7674387 Oil filtration system

US Patent 7682503 Filtration and surge with no moving parts

US Patent 7682504 System for growing crustaceans and other fish

US Patent 7686952 Liquid filtering apparatus

US Patent 7686956 Water purification system for storm drain channels

US Patent 7686965 Centrifugal fluid filtration devices, systems and methods

US Patent 7691268 Waste gas/wastewater treatment equipment and method of treating waste gas/wastewater

US Patent 7695616 Device for dissolving solid substances in water

US Patent 7695620 Tertiary filter septic system and method

US Patent 7699976 Upflow bioreactor with septum and pressure release mechanism

US Patent 7699983 Swimming pool skimmer comprising two independent pieces fixed to one another orientably

US Patent 7704387 Fryer filtration arrangement

US Patent 7708885 Anaerobic digestion apparatus, methods for anaerobic digestion and for minimizing the use of inhibitory polymers in digestion

US Patent 7713413 Aerated anoxic membrane bioreactor

US Patent 7713415 Method and apparatus for enhancing aquatic environments

US Patent 7718062 Wastewater purification plant by means of plants

US Patent 7718063 Treating pollutants by phytoleaching

US Patent 7718064 Integrated clean biomass to energy system

US Patent 7722768 Process for the simultaneous removal of BOD and phosphate from waste water

US Patent 7727387 Swimming pool skimmer pump assembly

US Patent 7727395 Method and apparatus for processing organic waste

US Patent 7727396 Anaerobic reactor with auger in the effluent line

US Patent 7731842 Submerged fixed film anoxic bioreactor

US Patent 7731850 Apparatus and method for treating wastewater

US Patent 7736496 Dual pump water treatment system for automatic top off

US Patent 7736508 System and method for biological wastewater treatment and for using the byproduct thereof

US Patent 7736509 Probiotic system and aquaculture devices

US Patent 7736510 Method for producing methane gas

US Patent 7736511 Feedback system for enhancing elimination of biomass in sewage sludge

US Patent 7736513 Liquid-solid fluidized bed waste water treatment system for simultaneous carbon, nitrogen and phosphorous removal

US Patent 7736523 Attachment for underwater surface cleaner

US Patent 7749395 Apparatus and methods for separating liquid from a waste product

US Patent 7754074 Filtering apparatus, back wash method therefor, filtering device and power plant

US Patent 7754079 Plant-based sewage treatment system for purifying wastewater

US Patent 7754080 Fixed film bioprocess for removing carbon compounds in oil and gas drilling sludge

US Patent 7754081 Method of wastewater treatment with excess sludge withdrawal reduced

US Patent 7758748 Surface skimmer with flotation support

US Patent 7758752 Composite material and method for removing harmful algal blooms and turning them into submerged macrophytes

US Patent 7758756 Lignocellulose-based anion-adsorbing medium (LAM) and process for making and using same for the selective removal of phosphate and arsenic anionic contaminants from aqueous solutions

US Patent 7763178 Biodegradable surface layer film for pools or spas to prevent evaporation and heat loss

US Patent 7767089 Membrane supported biofilm process for autotropic reduction

US Patent 7771592 Aquarium filter

US Patent 7771598 Apparatus, methods and systems for handling and processing waste material

US Patent 7775374 Self powered water purification system

US Patent 7776211 System and method for biological wastewater treatment and for using the byproduct thereof

US Patent 7776216 Floating aquatic plant culture systems and associated methods

US Patent 7776217 Bioretention system and method

US Patent 7785465 Apparatus and method for de-watering and purifying fuel oils and other liquids

US Patent 7785467 Method, composition and apparatus for high temperature production of methane from poultry waste

US Patent 7790033 Surface water treatment using flocculation and associated methods

US Patent 7790034 Apparatus and method for treating FGD blowdown or similar liquids

US Patent 7794590 Entrapping immobilization pellets for purifying breeding water, process and apparatus for purifying breeding water, and aquarium set

US Patent 7794591 Pool filter

US Patent 7794596 Method and apparatus for waste water treatment

US Patent 7799222 Method for producing hydrogen sulphide and the use thereof, in particular, for depolluting heavy metal-containing flows

US Patent 7799223 Biological nutrient removal process and process control for same

US Patent 7807053 Water filtration system

US Patent 7807056 System and method for bioremediating oil field cuttings

US Patent 7811448 Control system

US Patent 7811455 Removal of ammonia from fermentation effluent and sequestration as ammonium bicarbonate and/or carbonate

US Patent 7811456 Systems and methods for combining and converting solid and liquid organic waste materials into useful products

US Patent 7815795 Pool skimmer adapter

US Patent 7815796 Pool filter

US Patent 7815797 Pool, skimmer pre-filter assembly

US Patent 7819258 Fuel filter assembly

US Patent 7824551 Passive nutrient removal material mixes

US Patent 7828154 Systems and methods for filtering fuel

US Patent 7828963 Pool jet filter cleaner

US Patent 7828964 Pool filter cleaner

US Patent 7828974 Method for the treatment of ground water and soils using dried algae and other dried mixtures

US Patent 7833414 Polar fog waste treatment

US Patent 7837882 Treatment of a waste stream through production and utilization of oxyhydrogen gas

US Patent 7842186 Method of removing phosphorus and/or nitrogen

US Patent 7850848 Apparatus and process for biological wastewater treatment

US Patent 7850849 Anaerobic reactor for the removal of long chain fatty acids from fat containing wastewater

US Patent 7850850 Apparatus and methods for control of waste treatment processes

US Patent 7850851 Biological phosphorus removal

US Patent 7854840 Method for decomposing biogenic material

US Patent 7854841 Combined anaerobic process apparatus for treating organic wastes

US Patent 7854842 Apparatus and methods for control of waste treatment processes

US Patent 7857143 Suction filter and fuel supply device

US Patent 7862712 Swimming pool cleaning system

US Patent 7862721 Method for producing hydrogen sulphide and the use thereof, in particular, for depolluting heavy metal-containing flows

US Patent 7867389 Pool cleaning vehicle having an advanced drain system

US Patent 7867396 Water treatment apparatus, method and system

US Patent 7879234 Device for dissolving solid substances in water

US Patent 7879236 Micro gas attendant system

US Patent 7883622 Water treatment methods and systems using combinations of ozone and chlorine generators

US Patent 7887705 System for treating residual water

US Patent 7897042 Entrapping immobilization pellets for purifying breeding water, process and apparatus for purifying breeding water, and aquarium set

US Patent 7897047 Retention/detention pond and green roof passive nutrient removal material mixes

US Patent 7909173 Combined centrifugal separator

US Patent 7909995 Combined nutrient recovery and biogas scrubbing system integrated in series with animal manure anaerobic digester

US Patent 7910001 Arrangement of denitrification reactors in a recirculating aquaculture system

US Patent 7914675 Anaerobic purification of heated waste water

US Patent 7914676 Method for removing sulphate and heavy metals from waste water

US Patent 7918347 Cleaning apparatus

US Patent 7918995 Filter device for water tank

US Patent 7919000 Reactor comprising a supply distribution system for anaerobic waste water treatment

US Patent 7927483 Filter with self-positioning cartridge arrangement

US Patent 7927484 Passive underground drainfield for septic tank nutrient removal using functionalized green filtration media

US Patent 7927491 Integrated bio-digestion facility

US Patent 7931801 Aquarium filter system

US Patent 7935256 Method for the treatment of waste water from florfenicol production

US Patent 7947178 Method and apparatus for the anaerobic treatment of waste water

US Patent 7951293 Methods and apparatus for a pool treatment and water system

US Patent 7951296 Apparatus and method for agricultural animal wastewater treatment

US Patent 7955505 Method for removing pollutants from produced water

US Patent 7955507 Functionalized green filtration media for passive underground drainfield for septic tank nutrient removal

US Patent 7964099 Water filtering device

US Patent 7967150 Centrifugation dewatering apparatus

US Patent 7967151 Universal fuel recycling machine

US Patent 7972504 Skimmer apparatus for use with a body of water

US Patent 7972507 Advanced wastewater treatment process using up and down aerobic/anaerobic reactors of channel type

US Patent 7972511 Anaerobic treatment method and anaerobic treatment apparatus

US Patent 7972513 Process for treating nitrogenous wastewater with simultaneous autotrophic denitrification, hetertrophic denitrification and COD removal

US Patent 7975854 Rotary fan press

US Patent 7976706 Melt filter

US Patent 7976707 Apparatus and method for treating organic-containing wastewater

US Patent 7981291 Method and plant for the treatment of an aqueous waste stream

US Patent 7981292 System and method for biological wastewater treatment and for using the byproduct thereof

US Patent 7984811 Pivoting swimming pool tool device

US Patent 7985338 Algal purification system with efficient solar light utilization

US Patent 7988857 Method for treating mixed wastewater from pharmaceutical chemical industry park

US Patent 7993515 Surface skimming device for pools

US Patent 7993521 Plant and method for generating biogas from biologically degradable material containing liquid and solid components, in particular waste products, and a biogas generation container for use in the plant

US Patent 8002984 Green sorption material mixes for water treatment

US Patent 8002985 Passive nutrient removal material mixes

US Patent 8002986 Apparatus and methods for control of waste treatment processes

US Patent 8012345 Pool cleaning vehicle having side vents and ducts

US Patent 8012352 Optimized nutrient removal from wastewater