Patent US3381672A successfully refreshed from Google Patents.
US3381672A
Expired / Lapsed
US
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Impulse forming and like machines
Assignee: National Research Development Corp UK
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Filing: 1966-04-04
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Granted: 1968-05-07
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Expires: 1986-04-04
Abstract
No abstract record available.
Inventors
- 👤 Tobias Stephen Albert
- 👤 Bakhtar Farhang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:07
CPC Classifications
B; B21; B21J; B21J7/00; B21J7/20; B21J7/22; B21J7/24; B21J7/26; B30; B30B; B30B1/00; B30B1/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |