Patent US3584109A successfully refreshed from Google Patents.
US3584109A
Expired / Lapsed
US
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Drawing method
Assignee: Borg Warner Corp
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Filing: 1968-09-16
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Granted: 1971-06-08
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Expires: 1988-09-16
Abstract
Abstract DIMENSIONAL STABILITY; AND THE TEAR STRENGTH, ESPECIALLY AROUND THE LIP OF THE DRAWN ARTICLE, IS SIGNIFICANTLY HIGHER. A METHOD FOR DRAWING OR COLD FORMING PLASTIC SHEET MATERIAL BY APPLYING A RELATIVELY HIGH LOAD, ON THE ORDER OF 1500-4000 P.S.I., TO THE PERIPHERAL AREA OF THE BLANK DURING THE INITIAL STAGES OF THE DRAW; AND AS THE DRAWING CONTINUES, REDUCING THE LOADING TO ABOUT 300-600 P.S.I. THE AREA TO WHICH THE INITIAL HIGH LOADING IS APPLIED IS 5-15 PRECENT OF THE ENTIRE BLANK SURFACE. IN CARRYING OUT THE METHOD DESCRIBED, ARTICLES PRODUCED HAVE GREATER
Inventors
- 👤 William R Meadors
- 👤 Roger G Royer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:45
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/08; B29C51/082; B29C51/087
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |