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Patent US2690874A successfully refreshed from Google Patents.
US2690874A
Expired / Lapsed
US
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Dual action safety thermostat for liquid cooling systems
Assignee: Individual
•
Filing: 1953-12-21
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Granted: 1954-10-05
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Expires: 1973-12-21
Abstract
No abstract record available.
Inventors
- 👤 James L Stubblefield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:32
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/01; G05D23/12; G05D23/123; Y; Y10; Y10S; Y10S236/00; Y10S236/02; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7737; Y10T74/00; Y10T74/11
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) | 1957-10-04 | 1958-04-05 | 1958-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-04 | 1962-04-05 | 1962-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-04 | 1966-04-05 | 1966-10-05 | $7700.00 | Window Closed / Lapsed |