Patent US3294640A successfully refreshed from Google Patents.
Patent US2102941A successfully refreshed from Google Patents.
US2102941A
Expired / Lapsed
US
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Method of forming bolt heads
Assignee: Individual
•
Filing: 1937-06-02
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Granted: 1937-12-21
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Expires: 1957-06-02
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry Cadwallader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:16
CPC Classifications
B; B21; B21J; B21J5/00; B21J5/06; B21J5/08; B21J7/00; B21J7/02; B21J7/14; B21K; B21K1/00; B21K1/44; B21K1/46
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) | 1940-12-20 | 1941-06-21 | 1941-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-12-20 | 1945-06-21 | 1945-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-12-20 | 1949-06-21 | 1949-12-21 | $7700.00 | Window Closed / Lapsed |