Abstract: An all-terrain wheelchair includes a rigid and easy-to-assemble frame. The frame has a seating area with armrests toward the rear of the frame and an adjustable footrest area toward the front of the frame. Attached to the rear axle of the frame and outside the seating area are found two large rear wheels of a sufficient width to provide flotation over soft surfaces. Attached to the front axle of the frame in front of the footrest area is a single large wheel of a sufficient width to provide flotation over soft surfaces. An ergonomically designed push handle is found at the upper rear of the frame behind the seating area, which allows an assistant to propel the chair forward or pull it backward. The frame in front of the front wheel forms a pull handle, which allows an assistant to pull the chair forward or push it backward. A locking brake mechanism is attached to the rear axle to prevent a rear wheel from travel and render the wheelchair motionless when necessary.

Abstract: An all-terrain wheelchair includes a rigid and easy-to-assemble frame. The frame has a seating area with armrests toward the rear of the frame and an adjustable footrest area toward the front of the frame. Attached to the rear axle of the frame and outside the seating area are found two large rear wheels of a sufficient width to provide flotation over soft surfaces. Attached to the front axle of the frame in front of the footrest area is a single large wheel of a sufficient width to provide flotation over soft surfaces. An ergonomically designed push handle is found at the upper rear of the frame behind the seating area, which allows an assistant to propel the chair forward or pull it backward. The frame in front of the front wheel forms a pull handle, which allows an assistant to pull the chair forward or push it backward. A locking brake mechanism is attached to the rear axle to prevent a rear wheel from travel and render the wheelchair motionless when necessary.

Abstract: A salt of a polymer, containing acid groups, soluble or dispersible in water or organic solvents, is combined with a salt-forming pharmaceutically effective compound for application, orally, topically, or systemically. A sustained release of the pharmaceutical compound is thus obtained.

Abstract: Copolymers comprising acrylic or methacrylic acid and methyl methacrylate are neutralized by the addition of cyclic alkylene imines, preferably ethylene imine, to form a product which is capable of absorbing large amounts of material soluble in water, and slowly releasing those materials. The fundamental copolymer may be modified by the addition of cross-linking agents, chain terminators, plasticizers, etc., prior to treatment with the alkylene imine. The treated copolymers are particularly useful in the formation of contact lenses for the application of medicinals to the eye, and for other depot materials.