US3537308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Altitude and vertical velocity indicator
Assignee: EDCLIFF INSTRUMENTS Inc
•
Filing: 1967-06-09
•
Granted: 1970-11-03
•
Expires: 1987-06-09
Abstract
No abstract record available.
Inventors
- 👤 William W Darlington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:07
CPC Classifications
G; G01; G01C; G01C23/00; G01L; G01L9/00; G01L9/0082; G01L9/0085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2404746A
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US2931221A
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US2946012A
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US3068699A
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US3161059A
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US3064478A
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US3312110A
Cited
US3232530A
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US3321968A
Cited
US3358505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |