US2643741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elevator system having speed regulation and position control
Assignee: Westinghouse Electric Corp
•
Filing: 1951-03-26
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Granted: 1953-06-30
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Expires: 1971-03-26
Abstract
No abstract record available.
Inventors
- 👤 Walter H Esselman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:19
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/24; B66B1/28; B66B1/30; B66B1/34; B66B1/36; B66B1/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1948685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |