One piece molded games racket
Patent 4440392 Issued on April 3, 1984. Estimated Expiration Date: 
April 3, 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.
April 3, 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 1401567 1472202 3664668 3752478 3809402 3892831 Glass-carbon reinforced foamed resin tennis racket frame Tennis racket Racket Tennis racket InventorAssigneeApplicationNo. 06/229506 filed on 01/29/1981US Classes:473/535, Fiber reinforced plastic frame264/317, Removing mold by destruction264/328.9Including operation or design to minimize formation of gate, sprue, or flashExaminersPrimary: Pinkham, Richard C.Assistant: Schneider, Matthew L. Attorney, Agent or FirmInternational ClassesB29C 33/52 (20060101)B29C 45/44 (20060101) A63B 49/02 (20060101) A63B 49/10 (20060101) Foreign Application Priority Data1978-03-07 GBAbstractThe invention relates to games racket frames which are made from reinforced plastics material and have a hollow construction. The particular construction and method of the invention enable a satisfactory hollow product to be made by an injection moulding technique instead of the more laborious technique of building a suitable reinforced hollow construction around a mandrel.The frame is a hollow injection moulding of reinforced thermoplastics material in which the walls (21A and 21B) at the outer and inner circumference of the head (21) are joined by supports (25) through which the stringing holes (23) pass. The supports are integrally formed during the moulding. | |
