US2604887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Draft control for heating
Assignee: —
•
Filing: —
•
Granted: 1952-07-29
•
Expires: 1969-07-29
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:38
CPC Classifications
F; F23; F23M; F23M9/00; F23M9/003; F23M9/006; F23J; F23J11/00; F23L; F23L11/00; F23L13/00; F23L13/02; F23L17/00; F23L17/02; F23L3/00; F23J2213/00; F23J2213/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1928822A
Cited
US1760007A
Cited
US1891600A
Cited
US2030825A
Cited
US2127100A
Cited
US2344947A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-29 | 1956-01-28 | 1956-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-29 | 1960-01-28 | 1960-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-29 | 1964-01-28 | 1964-07-29 | $7700.00 | Window Closed / Lapsed |