US2489011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof ventilator
Assignee: Individual
•
Filing: 1946-04-23
•
Granted: 1949-11-22
•
Expires: 1966-04-23
Abstract
No abstract record available.
Inventors
- 👤 Fred A Dahlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:24
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1319526A
Cited
US683173A
Cited
US1128166A
Cited
US1380567A
Cited
US1289821A
Cited
US1425028A
Cited
US1893272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |