Apparatus for reducing torque and vibration in racquets
Patent 4330125 Issued on May 18, 1982. Estimated Expiration Date: 
August 22, 2000. 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.
August 22, 2000. 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 1558507 2738616 3109651 3907292 Tennis racket construction Racket frame Patent #: 4177990 InventorApplicationNo. 06/180412 filed on 08/22/1980US Classes:473/521For racket or paddleExaminersPrimary: Apley, Richard J.Attorney, Agent or FirmInternational ClassesA63B 49/00 (20060101)A63B 59/00 (20060101) AbstractA device for reducing torque and vibration caused by an off-center impact between a ball and the face of a racquet. The device includes tubular guide means located about the periphery of the racquet head. Mounted within the tubular guide means are a system of self-adjusting counterbalancing weights. Movement of the racquet by an off-center impact causes the counterbalancing weights to be displaced. The displacement of the weights offsets and balances the torque and vibration of the impact. | |
