Bone screw
Patent 4175555 Issued on November 27, 1979. Estimated Expiration Date: 
February 22, 1998. 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.
February 22, 1998. 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 146023 2801631 InventorAssigneeApplicationNo. 05/880099 filed on 02/22/1978US Classes:606/73, Threaded fastener element411/415Of varying thread pitchExaminersPrimary: Frinks, Ronald L.Attorney, Agent or FirmInternational ClassesA61B 17/86 (20060101)A61B 17/68 (20060101) F16B 5/02 (20060101) Foreign Application Priority Data1977-02-24 AUAbstractA bone screw is provided with screw threads which are like-handed but of different pitch on its respective leading and trailing ends. In the more favored embodiment, the pitch of the leading screw thread exceeds that of the trailing screw thread. Such a screw may be used to hold portions of a fractured bone in compressive engagement.Other References
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