US1390758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermostatic control for dampers for unit ventilators
Assignee: Individual
•
Filing: 1920-05-13
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Granted: 1921-09-13
•
Expires: 1940-05-13
Abstract
No abstract record available.
Inventors
- 👤 Michael J Callahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:07
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/01; G05D23/12; G05D23/125; F; F24; F24F; F24F11/00; F24F11/70; F24F11/80; F24F11/81
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) | 1924-09-12 | 1925-03-14 | 1925-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-09-12 | 1929-03-14 | 1929-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-09-12 | 1933-03-14 | 1933-09-13 | $7700.00 | Window Closed / Lapsed |