US3065413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic gradiometer system
Assignee: AT&T Inc
•
Filing: 1945-09-29
•
Granted: 1962-11-20
•
Expires: 1965-09-29
Abstract
No abstract record available.
Inventors
- 👤 John G Ferguson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:51
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2406870A
Cited
US2379716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-11-19 | 1966-05-21 | 1966-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-19 | 1970-05-21 | 1970-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-19 | 1974-05-21 | 1974-11-20 | $7700.00 | Window Closed / Lapsed |