US2632038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical velocity indicator
Assignee: NORDEN LAB CORP
•
Filing: 1944-12-13
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Granted: 1953-03-17
•
Expires: 1964-12-13
Abstract
No abstract record available.
Inventors
- 👤 Hofstadter Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:49
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/48; G06G7/78; G01; G01P; G01P3/00; G01P3/62; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1889876A
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US2251973A
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US2266449A
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US2244369A
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US2217220A
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US2268587A
Cited
US2301115A
Cited
US2324215A
Cited
US2373145A
Cited
US2360523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |