US3587786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zone demand elevator system
Assignee: Westinghouse Electric Corp
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Filing: 1969-11-18
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Granted: 1971-06-28
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Expires: 1989-11-18
Abstract
Abstract AN ELEVATOR SYSTEM IN WHICH AVAILABLE CARS ARE ASSIGNED TO PROCEED TO ZONES OF FLOORS SELECTED IN ACCORDANCE WITH AN EFFECTIVE PATTERN OF ZONES REQUIRING SERVICE AND THE PATTERN OF CARS ALREADY SERVING CORRIDOR CALLS IS IMPROVED BY ALTERING THE EFFECTIVE PATTERN OF ZONES REQUIRING SERVICE WHEN ALL OF THE ZONES HAVING UNANSWERED CORRIDOR CALLS THEREIN HAVE BEEN PROVIDED FOR AN AN ADDITIONAL CAR BECOMES AVAILABLE SO THAT THE ADDITIONAL AVAILABLE CAR CAN BE ASSIGNED TO ASSIST IN SERVING CORRIDOR CALLS.
Inventors
- 👤 Henry C Savino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:34
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/02; B66B1/06; B66B1/14; B66B1/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |