Patent US2441398A successfully refreshed from Google Patents.
US2441398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined flue and check draft damper unit
Assignee: Individual
•
Filing: 1943-07-16
•
Granted: 1948-05-11
•
Expires: 1963-07-16
Abstract
No abstract record available.
Inventors
- 👤 Elia Joseph A D
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:57
CPC Classifications
F; F23; F23L; F23L13/00; F23L13/02
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-11 | 1951-11-10 | 1952-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-11 | 1955-11-10 | 1956-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-11 | 1959-11-10 | 1960-05-11 | $7700.00 | Window Closed / Lapsed |