Patent US3620113A successfully refreshed from Google Patents.
US3620113A
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US
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Ejector type punch
Assignee: Dayton Progress Corp
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Filing: 1969-09-08
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Granted: 1971-11-16
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Expires: 1989-09-08
Abstract
Abstract A PIERCING OR FORMING PUNCH ASSEMBLY HAVING A HEADED RECIPROCABLE EJECTOR MEMBER ACCOMMODATED IN THE PUNCH BODY. A UNIQUELY FORMED URETHANE WASHER OR LIKE DEVICE IS FITTED AROUND THE SHANK OF THE EJECTOR MEMBER TO THE UNDERSIDE OF THE HEAD THEREOF TO ACT AS A LOAD DISTRIBUTING AND SHOCK ABSORBING MEDIUM. THE WASHER IS CONSTRUCTED TO PROVIDE A PUMP SUPPLYING AIR TO THE WORKING FACE OF THE PUNCH FOR VACUUM BREAKING AND DEBRIS CLEARING PURPOSES.
Inventors
- 👤 Robert J Gargrave
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:16
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/24; B21D28/34; B21D45/00; B21D45/02; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2066; Y10T83/2092; Y10T83/2096; Y10T83/2122; Y10T83/2129; Y10T83/2133; Y10T83/2135; Y10T83/215; Y10T83/2155; Y10T83/2159; Y10T83/929; Y10T83/9457; Y10T83/9473; Y10T83/9476
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |