US3546580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic field variometer using a low noise amplifier and a coil-core arrangement of minimum weight and maximum sensitivity
Assignee: Boeing North American Inc
•
Filing: 1967-06-06
•
Granted: 1970-12-08
•
Expires: 1987-06-06
Abstract
No abstract record available.
Inventors
- 👤 Donald P Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:10
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA464880A
Cited
GB318110A
Cited
US1813857A
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US2436394A
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US2462884A
Cited
US2964700A
Cited
US2931974A
Cited
US3149278A
Cited
US3085197A
Cited
US3234491A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-07 | 1974-06-08 | 1974-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-07 | 1978-06-08 | 1978-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-07 | 1982-06-08 | 1982-12-08 | $7700.00 | Window Closed / Lapsed |