US2023627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling the temperature of a fluid
Assignee: AT&T Inc
•
Filing: 1931-12-10
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Granted: 1935-12-10
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Expires: 1951-12-10
Abstract
No abstract record available.
Inventors
- 👤 Carl M Underwood
- 👤 Pugh Emerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:17
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/22; G05D23/1906; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2511
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-12-09 | 1939-06-10 | 1939-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-12-09 | 1943-06-10 | 1943-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-12-09 | 1947-06-10 | 1947-12-10 | $7700.00 | Window Closed / Lapsed |