Patent US3767757A successfully refreshed from Google Patents.
US3767757A
Expired / Lapsed
US
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Method of polymer fabrication under hydrostatic pressure
Assignee: AT&T Inc
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Filing: 1972-03-13
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Granted: 1973-10-23
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Expires: 1992-03-13
Abstract
Abstract THE PRODUCTION OF MANY ARTICLES MADE FROM POLYMERIC MATERIALS CAN BE ECONOMICALLY PERFORMED BY MECHANICAL COLD FORMING OPERATIONS. IT IS DISCLOSED HERE THAT FOR MANY POLYMERIC MATERIALS THESE OPERATIONS CAN BE FACILITATED BY THE APPLICATION OF HYDROSTATIC PRESSURE, TYPICALLY IN THE 5,000 TO 15,000 POUND PER SQUARE INCH RANGE. THIS IS DUE TO THE DISCOVERY THAT, WHILE PRESSURE, EACH OF THESE POLYMERIC MATERIALS POSSESSES A DUCTILITY PEAK AS GREAT AS A FACTOR OF FIVE.
Inventors
- 👤 W Vroom
- 👤 R Westover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:23
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/0029; B29C43/00; B29C43/02; B29C43/10
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |