Patent US2447439A successfully refreshed from Google Patents.
US2447439A
Expired / Lapsed
US
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Self-locking screw
Assignee: Individual
•
Filing: 1945-12-12
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Granted: 1948-08-17
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Expires: 1965-12-12
Abstract
No abstract record available.
Inventors
- 👤 Roy E Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:32
CPC Classifications
F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/22; F16H25/2204; F16H25/24; F16H25/2454; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/929; Y10T; Y10T74/00; Y10T74/15; Y10T74/1526; Y10T74/1527; Y10T74/18; Y10T74/18568; Y10T74/18576; Y10T74/18704; Y10T74/19; Y10T74/1987; Y10T74/19893; Y10T74/19898; Y10T74/19902; Y10T74/19949; Y10T74/19958
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US158976A
Cited
US611832A
Cited
US1885970A
Cited
US1847693A
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US2151094A
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US2098816A
Cited
US2214493A
Cited
US2298011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-17 | 1952-02-16 | 1952-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-17 | 1956-02-16 | 1956-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-17 | 1960-02-16 | 1960-08-17 | $7700.00 | Window Closed / Lapsed |