US2431790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced resistance type temperature control apparatus
Assignee: C A DUNHAM Co
•
Filing: 1940-08-02
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Granted: 1947-12-02
•
Expires: 1960-08-02
Abstract
No abstract record available.
Inventors
- 👤 Jr David N Crosthwait
- 👤 Everett W Werts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:55
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/10; F24D19/1006; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1902; G05D23/1904; G05D23/20; G05D23/24
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-01 | 1951-06-02 | 1951-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-01 | 1955-06-02 | 1955-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-01 | 1959-06-02 | 1959-12-02 | $7700.00 | Window Closed / Lapsed |