US3513708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Altitude indicating and reporting system
Assignee: Individual
•
Filing: 1968-06-24
•
Granted: 1970-05-26
•
Expires: 1988-06-24
Abstract
No abstract record available.
Inventors
- 👤 Earl W Springer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:24
CPC Classifications
G; G01; G01C; G01C5/00; G01C5/005; G01L; G01L27/00; G01L27/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2046005A
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US2142602A
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US2265149A
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US2351081A
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US2430780A
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US3304553A
Cited
US3397319A
Cited
US3423597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-25 | 1973-11-24 | 1974-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-25 | 1977-11-24 | 1978-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-25 | 1981-11-24 | 1982-05-26 | $7700.00 | Window Closed / Lapsed |