US3568487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for hydromechanical deep-drawing
Assignee: SMG Sueddeutsche Maschinenbau GmbH
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Filing: 1968-07-12
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Granted: 1971-03-09
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Expires: 1988-07-12
Abstract
Abstract IN A DEEP-DRAWING APPARATUS WHEREIN A METAL SHEET IS FORCED INTO A DIE AGAINST WATER PRESSURE, THERE IS PROVIDED A SUPPORTING PISTON THE TERMINAL FACE OF WHICH IS IN CONTACT WITH AN AREA OF SAID SHEET ON THE UNDERSIDE THEREOF DURING THE DRAWING PROCESS PREVENTING SAID AREA FROM BEING EXPOSED TO SAID WATER PRESSURE FOR THE ULTIMATE PURPOSE OF REDUCING THE REQUIRED RAMMING FORCE.
Inventors
- 👤 Heinrich Riesener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:37
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/20; B21D22/205
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |