Patent US2708539A successfully refreshed from Google Patents.
US2844830A
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Method of radially extruding portions of a hollow blank to form external threads of wave form
Assignee: Lock Thread Corp
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Filing: 1954-04-05
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Granted: 1958-07-29
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Expires: 1974-04-05
Abstract
No abstract record available.
Inventors
- 👤 Edwin R Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:42
CPC Classifications
B; B21; B21C; B21C23/00; B21C23/02; B21C23/04; B21C23/08; B21C23/10; B21K; B21K1/00; B21K1/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US463444A
Cited
US2036551A
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US1098716A
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DE614089C
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US2093646A
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US2600118A
Cited
US2637361A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |