US2620381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetometer gradiometer apparatus and method
Assignee: Individual
•
Filing: 1947-05-27
•
Granted: 1952-12-02
•
Expires: 1967-05-27
Abstract
No abstract record available.
Inventors
- 👤 Fred M Mayes
- 👤 Alvin J Tickner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:36
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/04; G01R33/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2291692A
Cited
US2407202A
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US2406870A
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US2415808A
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US2414654A
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US2427666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |