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US2511697A
Expired / Lapsed
US
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Elevator safety apparatus
Assignee: Individual
•
Filing: 1947-12-12
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Granted: 1950-06-13
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Expires: 1967-12-12
Abstract
No abstract record available.
Inventors
- 👤 William C Clift
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:31
CPC Classifications
B; B66; B66B; B66B5/00; B66B5/02; B66B5/04; B66B5/044; B66B5/06; B66B5/16; B66B5/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1924310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-12 | 1953-12-12 | 1954-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-12 | 1957-12-12 | 1958-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-12 | 1961-12-12 | 1962-06-13 | $7700.00 | Window Closed / Lapsed |