US2489515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Building ventilator having air inlets and outlets
Assignee: NORTHCO INSULATING AND VENTILA
•
Filing: 1946-10-09
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Granted: 1949-11-29
•
Expires: 1966-10-09
Abstract
No abstract record available.
Inventors
- 👤 Robert E Blake
- 👤 Walter L Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:46
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/04; F24F7/06; F24F7/08; F24F13/00; F24F13/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1968431A
Cited
US2067144A
Cited
US2166906A
Cited
US2281002A
Cited
US2266986A
Cited
US2419806A
Cited
US2427075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |