Patent US3537308A successfully refreshed from Google Patents.
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
2026-11-04 10:13
CPC Classifications
G; G01; G01C; G01C23/00; G01L; G01L9/00; G01L9/0082; G01L9/0085
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2404746A
Cited
US2931221A
Cited
US2946012A
Cited
US3068699A
Cited
US3161059A
Cited
US3064478A
Cited
US3312110A
Cited
US3232530A
Cited
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 |