Punch
Patent 4739687 Issued on April 26, 1988. Estimated Expiration Date: 
May 27, 2006. 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.
May 27, 2006. 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 267751 891516 1097669 2126519 2217560 2287168 3580269 InventorsApplicationNo. 06/866659 filed on 05/27/1986US Classes:83/688, Plural spaced successively operative shearing portions83/689Progressive cuttingExaminersPrimary: Kazenske, E. R.Assistant: Phan, Hien H. Attorney, Agent or FirmInternational ClassesB21D 28/34 (20060101)B26F 1/14 (20060101) B26F 1/02 (20060101) AbstractThe punch includes a working end with multiple working surfaces of special configuration to reduce the force required to effect punching and improve stripping action from the workpiece. | |
