Patent US2606539A successfully refreshed from Google Patents.
US2606539A
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US
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Valve control for engine cooling systems
Assignee: Individual
•
Filing: 1946-05-27
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Granted: 1952-08-12
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Expires: 1966-05-27
Abstract
No abstract record available.
Inventors
- 👤 Jr Howard Field
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:30
CPC Classifications
F; F01; F01P; F01P5/00; F01P5/14; F01P7/00; F01P7/14; F01P7/16; F01P2060/00; F01P2060/02; F01P2070/00; F01P7/165; F02; F02B; F02B29/00; F02B29/04; F02B29/0406; F02B29/0437; F02B29/0443; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2562; Y10T137/2703; Y10T137/7722; Y10T137/7771; Y10T137/7781; Y10T137/7782; Y10T137/7832
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) | 1955-08-12 | 1956-02-11 | 1956-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-12 | 1960-02-11 | 1960-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-12 | 1964-02-11 | 1964-08-12 | $7700.00 | Window Closed / Lapsed |