US Patent 8099868 Disposable blade cartridge utility knife

A utility knife having a disposable blade cartridge is presented. The cartridge can include a stem having catches, where the stem can be inserted into an opening of the knife's handle. The cartridge can be releasably attached to the handle by allowing the catches to latch on to a shoulder portion of an opening in the handle. The opening can be defined by the shoulder and a rib that separates the opening from a neighboring opening.