Patent US2488404A successfully refreshed from Google Patents.
US2488404A
Expired / Lapsed
US
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Preset speed control system for drives
Assignee: Westinghouse Electric Corp
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Filing: 1947-09-27
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Granted: 1949-11-15
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Expires: 1967-09-27
Abstract
No abstract record available.
Inventors
- 👤 Walter R Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:10
CPC Classifications
F; F23; F23G; F23G5/00; F23G5/08; F23G5/10; H; H02; H02P; H02P23/00; H02P23/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-14 | 1953-05-16 | 1953-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-14 | 1957-05-16 | 1957-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-14 | 1961-05-16 | 1961-11-15 | $7700.00 | Window Closed / Lapsed |