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Patent US3461387A successfully refreshed from Google Patents.
US3461387A
Expired / Lapsed
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Magnetic field detector using a variable inductance rod
Assignee: Electro Mechanics Co
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Filing: 1965-04-20
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Granted: 1969-08-12
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Expires: 1985-04-20
Abstract
No abstract record available.
Inventors
- 👤 Fred J Morris
- 👤 George F Roberts
- 👤 Robert L Waters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:11
CPC Classifications
H; H03; H03D; H03D1/00; G; G01; G01R; G01R33/00; G01R33/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-11 | 1973-02-10 | 1973-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-11 | 1977-02-10 | 1977-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-11 | 1981-02-10 | 1981-08-12 | $7700.00 | Window Closed / Lapsed |