US Patent 7980337 Stair climbing device
Patent 7980337 was granted and assigned to Nanyang Polytechnic on July, 2011 by the United States Patent and Trademark Office.
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Patent abstract
The present invention provides a device for safely and conveniently conveying an object on a slope. The safety feature includes a fail-safe one-way brake comprising a ratchet wheel, a pawl and a biasing means. In one embodiment, the device is foldable; in another embodiment, the device is integrated with a suitcase; in yet another embodiment, the device is motorized.
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Patent Citations Received
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Patent Inventor Names
Chin Sai Wong0
Kannappan@Suresh A/L Lynkaran0
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US Patent 07980337 Stair climbing device US Patent 7980337 Stair climbing device
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Patent Number
079803370
Patent Number
79803370
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Infobox
Is a
Current Assignee
Patent Jurisdiction
Patent Number
079803370
Date of Patent
July 19, 2011
0Patent Application Number
125314910
Date Filed
March 16, 2007
0Patent Primary Examiner
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US Patent 07980337 Stair climbing device
Infobox
Is a
Current assignee
Patent jurisdiction
Patent number
07980337
Date of patent
July 19, 2011
Patent application number
12531491
Date Filed
March 16, 2007
Patent primary examiner
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