Patent US3435916A successfully refreshed from Google Patents.
US3435916A
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US
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Elevator motor speed control including a high gain forward loop and lag-lead compensation
Assignee: Schindler Elevator Corp
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Filing: 1964-06-04
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Granted: 1969-04-01
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Expires: 1984-06-04
Abstract
No abstract record available.
Inventors
- 👤 Robert E Bell
- 👤 Donivan L Hall
- 👤 Richard C Loshbough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:19
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/24; B66B1/28; B66B1/30; B66B1/285; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/902; Y10S388/904; Y10S388/907; Y10S388/909; Y10S388/917
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US324290A
Cited
US2448564A
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US2470099A
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US2620898A
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US2643741A
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US3297110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-31 | 1972-09-30 | 1973-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-31 | 1976-09-30 | 1977-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-31 | 1980-09-30 | 1981-04-01 | $7700.00 | Window Closed / Lapsed |