US2632374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft cabin rate of climb control instrument
Assignee: Douglas Aircraft Co Inc
•
Filing: 1951-03-20
•
Granted: 1953-03-24
•
Expires: 1971-03-20
Abstract
No abstract record available.
Inventors
- 👤 Wolfgang B Klemperer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:45
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/02; B64D13/04; G; G05; G05D; G05D16/00; G05D16/20; G05D16/2006; G05D16/2013
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1557822A
Cited
US1634961A
Cited
US1935736A
Cited
US2002057A
Cited
US2077267A
Cited
US2208554A
Cited
US2307199A
Cited
US2396116A
Cited
US2549690A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-23 | 1956-09-22 | 1957-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-23 | 1960-09-22 | 1961-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-23 | 1964-09-22 | 1965-03-24 | $7700.00 | Window Closed / Lapsed |