Patent US2697554A successfully refreshed from Google Patents.
US2697554A
Expired / Lapsed
US
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Temperature responsive valve device
Assignee: Westinghouse Air Brake Co
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Filing: 1951-05-16
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Granted: 1954-12-21
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Expires: 1971-05-16
Abstract
No abstract record available.
Inventors
- 👤 Robert M Kendig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:00
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/185; F; F02; F02C; F02C9/00; F02C9/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US339756A
Cited
US773684A
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US1630318A
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US2409871A
Cited
US2512561A
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US2606420A
Cited
US2524445A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |