US2496862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilation system
Assignee: Douglas Aircraft Co Inc
•
Filing: 1946-07-15
•
Granted: 1950-02-07
•
Expires: 1966-07-15
Abstract
No abstract record available.
Inventors
- 👤 Mar Bruce E Del
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:29
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/02; B64D13/04; Y; Y02; Y02T; Y02T50/00; Y02T50/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2109512A
Cited
US2002057A
Cited
US1985050A
Cited
US2119402A
Cited
US2328489A
Cited
US2303334A
Cited
US2444951A
Cited
US2439793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |