US2684621A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Attic ventilator
Assignee: Loren Cook Co
•
Filing: 1952-12-05
•
Granted: 1954-07-27
•
Expires: 1972-12-05
Abstract
No abstract record available.
Inventors
- 👤 Cook Loren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:33
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/02; F24F7/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1318312A
Cited
US1532635A
Cited
US1584247A
Cited
US1844727A
Cited
US2439271A
Cited
US2551004A
Cited
US2641987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |