NONOBVIOUSNESS Carter

Chosen Invention

Patent 4252138: Adjustable Crutch for Raising From Seated to Standing Position

Date Issued: February 24, 1981

The foundation of the invention is a crutch with a length that can be manually adjusted through the use of a lever. The user reduces the height of both crutches to a minimum while in a seated position and then places his weight upon both crutches. In order to raise to a standing position, the user alternately shifts his weight from one crutch to the other, while operating the lever on the crutch that is not supporting any weight. By operating the lever of the non supportive crutch, the user can increase the length iteratively until both crutches are at the proper height for standing position.

Evaluation of Patent with regard to Cases: Hotchkiss v. Greenwod, A&P Tea Co. v. Supermarket Corp., and Lyon vs. Bausch & Lomb