US2540941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latch mechanism
Assignee: Individual
•
Filing: 1945-03-17
•
Granted: 1951-02-06
•
Expires: 1965-03-17
Abstract
No abstract record available.
Inventors
- 👤 Clifton B Graham
- 👤 Vinton D Carver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:19
CPC Classifications
F; F16; F16K; F16K21/00; F16K21/04; F16K21/18; F16K21/20; Y; Y10; Y10T; Y10T74/00; Y10T74/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US463198A
Cited
US681081A
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US736152A
Cited
US1642760A
Cited
US1568817A
Cited
US2013798A
Cited
US2174969A
Cited
US2256965A
Cited
US2328552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |