Patent US2771835A successfully refreshed from Google Patents.
US2771835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating device, including ventilating louvers
Assignee: Individual
•
Filing: 1954-03-30
•
Granted: 1956-11-27
•
Expires: 1974-03-30
Abstract
No abstract record available.
Inventors
- 👤 Albert J Weaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:00
CPC Classifications
F; F24; F24F; F24F7/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1408411A
Cited
US1672291A
Cited
US2069370A
Cited
US2326408A
Cited
US2595885A
Cited
US2526770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |