Implement for striking a ball
Patent 4180265 Issued on December 25, 1979. Estimated Expiration Date: 
July 15, 1997. 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.
July 15, 1997. 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 1526734 2528239 2732209 Tennis rackets and similar implements with vibration damper Patent #: 3941380 InventorAssigneeApplicationNo. 05/816032 filed on 07/15/1977US Classes:473/522Contacts stringExaminersPrimary: Apley, Richard J.Attorney, Agent or FirmInternational ClassA63B 59/00 (20060101)Foreign Application Priority Data1977-03-31 ATAbstractThis invention relates to means for suppressing vibration in implements which serve to strike the ball and comprise a striking surface, a hoop which encloses the striking surface, and a handle. The invention relates particularly to tennis rackets and aims at suppressing the high-frequency vibration which is excited by the impact of the ball.In these striking implements, at least two longitudinal or transverse strings or at least one longitudinal string and at least one transverse string are mechanically coupled to each other by a vibration absorber. | |
