US2633299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damper and heater control system
Assignee: —
•
Filing: —
•
Granted: 1953-03-31
•
Expires: 1970-03-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:34
CPC Classifications
F; F23; F23L; F23L13/00; F23L13/02; F23L11/00; F23L3/00; F23N; F23N3/00; F23N3/04; F23N5/00; F23N5/20; F23N5/203; F23N2235/00; F23N2235/02; F23N2235/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1833888A
Cited
US2113440A
Cited
US2075986A
Cited
US2067426A
Cited
US2226081A
Cited
US2226510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |