US2685247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double-acting roof ventilator
Assignee: Individual
•
Filing: 1952-03-13
•
Granted: 1954-08-03
•
Expires: 1972-03-13
Abstract
No abstract record available.
Inventors
- 👤 Jr Joris R Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:41
CPC Classifications
A; A24; A24B; A24B1/00; A24B1/02; F; F24; F24F; F24F7/00; F24F7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1309867A
Cited
US1432135A
Cited
US1354008A
Cited
US1785540A
Cited
US2232027A
Cited
US2406168A
Cited
US2601423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-02 | 1958-02-01 | 1958-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-02 | 1962-02-01 | 1962-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-02 | 1966-02-01 | 1966-08-03 | $7700.00 | Window Closed / Lapsed |