US2230446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control system for warm air furnaces
Assignee: Cook Electric Co
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Filing: 1934-07-16
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Granted: 1941-02-04
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Expires: 1954-07-16
Abstract
No abstract record available.
Inventors
- 👤 John S Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:56
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2064; F24H9/2085; F24H15/00; F24H15/10; F24H15/128; F24H15/20; F24H15/25; F24H15/254; F24H15/30; F24H15/33; F24H15/345; F24H15/35; F24H15/355; F24H15/36; F24H15/40; F24H15/407; H; H01; H01F; H01F29/00; H01F29/08; H01F29/10
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) | 1944-02-04 | 1944-08-05 | 1945-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-02-04 | 1948-08-05 | 1949-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-02-04 | 1952-08-05 | 1953-02-04 | $7700.00 | Window Closed / Lapsed |