Safety tennis racquet
Patent 4488722 Issued on December 18, 1984. Estimated Expiration Date: 
December 18, 2001. 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.
December 18, 2001. 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 References 1132214 Tennis racket and method of making same Game racket Tennis-racket Patent #: 4273331 InventorApplicationNo. 06/315895 filed on 10/28/1981US Classes:473/543Prefabricated string assembly, means to prevent relative movement or wear at crossover points of strings, or having one or more strings with specified characteristic or arrangementExaminersPrimary: Pinkham, Richard C.Assistant: Schneider, Matthew L. Attorney, Agent or FirmInternational ClassesA63B 51/00 (20060101)A63B 51/10 (20060101) AbstractA tennis racquet having at least mostly non-interwoven strings, a plurality of ball grips or string-protectors, each ball grip having an opening therethrough receiving a respective main string, retaining units holding each of the grips in a position along its main string, the grips being preferably multiple row-groups of grip-tubes each row-group being held together as a unit and called a spinner, the spinners being disposed spaced along the mains. | |
