US2491948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elevator system
Assignee: Westinghouse Electric Corp
•
Filing: 1947-10-07
•
Granted: 1949-12-20
•
Expires: 1967-10-07
Abstract
No abstract record available.
Inventors
- 👤 Berkovitz Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:43
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/34; B66B1/36; B66B1/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1931564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |