US2620898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elevator motor control system
Assignee: Westinghouse Electric Corp
•
Filing: 1950-05-26
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Granted: 1952-12-09
•
Expires: 1970-05-26
Abstract
No abstract record available.
Inventors
- 👤 Alvin O Lund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:07
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/24; B66B1/28; B66B1/30; B66B1/285
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1884446A
Cited
US2508179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |