US2765187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extension unit for door lock latches
Assignee: CHALLENGER LOCK Co Inc
•
Filing: 1956-02-20
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Granted: 1956-10-02
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Expires: 1976-02-20
Abstract
No abstract record available.
Inventors
- 👤 Roy L Crandell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:50
CPC Classifications
E; E05; E05C; E05C1/00; E05C1/08; E05C1/12; E05C1/16; E05B; E05B63/00; E05B63/06; Y; Y10; Y10T; Y10T292/00; Y10T292/03; Y10T292/06; Y10T292/62
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) | 1959-10-02 | 1960-04-02 | 1960-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-02 | 1964-04-02 | 1964-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-02 | 1968-04-02 | 1968-10-02 | $7700.00 | Window Closed / Lapsed |