US2641337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elevator control system
Assignee: Westinghouse Electric Corp
•
Filing: 1951-01-17
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Granted: 1953-06-09
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Expires: 1971-01-17
Abstract
No abstract record available.
Inventors
- 👤 Alvin O Lund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:51
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/34; B66B1/3476; B66B1/36; B66B1/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2487891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |