Patent US1952350A successfully refreshed from Google Patents.
US1952350A
Expired / Lapsed
US
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Automatic control for heating and ventilating
Assignee: ARMSTRONG HEAT CONTROL Co
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Filing: 1931-06-13
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Granted: 1934-03-27
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Expires: 1951-06-13
Abstract
No abstract record available.
Inventors
- 👤 Charles E Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:29
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/275; G05D23/27535; G05D23/27541
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) | 1937-03-26 | 1937-09-25 | 1938-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-03-26 | 1941-09-25 | 1942-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-03-26 | 1945-09-25 | 1946-03-27 | $7700.00 | Window Closed / Lapsed |