Laminated fiberglass tennis racket
Patent 3993308 Issued on November 23, 1976. Estimated Expiration Date: 
November 23, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 23, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorApplicationNo. 422510 filed on 12/07/1973US Classes:473/535, Fiber reinforced plastic frame264/258, Joining a plurality of superposed fibrous or textile layers425/405.1MEANS TO CREATE A VACUUM OR APPLY FLUID PRESSURE WITHIN A PRESS FORMING MOLDExaminersPrimary: Apley, Richard J.Attorney, Agent or FirmAbstractA one-piece molded tennis racket or similar article constructed of resin-impregnated fabric consisting essentially of a plurality of substantially continuous fibers some of which extend from the butt of the handle, around the head frame and back down the handle, and other continuous fibers which extend just around the head frame. In one embodiment of the invention, the unique laminating technique provides a hollow tubular handle. In another embodiment of the invention, a flat handle is formed consisting of a pair of hollow-rectangular channels. The principal advantage of the racket in its finished form is that it has a high-strength-to-weight ratio. | |
