US2889763A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Building ventilating apparatus
Assignee: Individual
•
Filing: 1956-09-12
•
Granted: 1959-06-09
•
Expires: 1976-09-12
Abstract
No abstract record available.
Inventors
- 👤 Wilbur M Pine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:01
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/04; F24F7/06; F24F1/00; F24F1/0007; F24F1/0071; Y; Y02; Y02B; Y02B30/00; Y02B30/54; Y10; Y10S; Y10S52/00; Y10S52/08
Claims Analysis
Total Claims: 0
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US2499478A
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US2865247A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |