US3587372A
Expired / Lapsed
US
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Method and apparatus for cutting a workpiece
Assignee: Stafford Tool and Die Co Ltd
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Filing: 1969-03-26
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Granted: 1971-06-28
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Expires: 1989-03-26
Abstract
Abstract A PRESS MACHINE WITH PLATENS MOVED RELATIVELY TO ONE ANOTHER BY TWO PISTON AND CYLINDER UNITS OF DIFFERENT CAPACITY ACTING SUCCESSIVELY. THE OPERATIVE POSITIONS OF THE UNITS ARE ADJUSTABLE RELATIVELY AND IN UNISON. A FORM TOOL IS PLACED BETWEEN THE PLATENS TO ENGAGE A WORKPIECE AND HEATING MEANS IS CONNECTED TO THE FORM TOOL TO LOCALLY HEAT THE WORKPIECE. IN USE, THE FORM TOOL IS DRIVEN INTO THE WORKPIECE TO A PREDETERMINED DEPTH BY ONE OF THE UNITS WITH SIMULTANEOUS OPERATION OF THE HEATING MEANS. THEREAFTER A FINAL MOVEMENT OF THE TOOL AT INCREASED FORCE IS EFFECTED BY THE OTHER UNIT TO COMPLETE THE PENTRATION OF THE WORKPIECE.
Inventors
- 👤 Thomas B Prew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:21
CPC Classifications
B; B30; B30B; B30B1/00; B30B1/02; B30B1/08; A; A43; A43D; A43D25/00; A43D25/06; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/0405; Y10T83/041; Y10T83/0414; Y10T83/283; Y10T83/293; Y10T83/869; Y10T83/8696; Y10T83/8735
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |