US2852756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Call-registered signals for elevator systems
Assignee: Westinghouse Electric Corp
•
Filing: 1953-08-17
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Granted: 1958-09-16
•
Expires: 1973-08-17
Abstract
No abstract record available.
Inventors
- 👤 William F Eames
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:03
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/34; B66B1/46; B66B1/468; B66B2201/00; B66B2201/40; B66B2201/46; B66B2201/4607; B66B2201/4623; B66B2201/463
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1311650A
Cited
US1942415A
Cited
US2501320A
Cited
US2620395A
Cited
US2568348A
Cited
US2741755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |