US2551965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof ventilator
Assignee: Individual
•
Filing: 1946-01-05
•
Granted: 1951-05-08
•
Expires: 1966-01-05
Abstract
No abstract record available.
Inventors
- 👤 Elmer W Petersen
- 👤 Raymond F Sansonetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:22
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1264056A
Cited
US1831498A
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US1980039A
Cited
US2216873A
Cited
US2300842A
Cited
US2364144A
Cited
US2363879A
Cited
US2382076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |