Patent US2521816A successfully refreshed from Google Patents.
US2521816A
Expired / Lapsed
US
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Double spiral ratchet wrench
Assignee: Individual
•
Filing: 1946-10-08
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Granted: 1950-09-12
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Expires: 1966-10-08
Abstract
No abstract record available.
Inventors
- 👤 Raymond B Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:33
CPC Classifications
B; B25; B25B; B25B15/00; B25B15/06; Y; Y10; Y10S; Y10S81/00; Y10S81/02; Y10T; Y10T408/00; Y10T408/63; Y10T408/65; Y10T74/00; Y10T74/15; Y10T74/1526; Y10T74/1527
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) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |