US2436039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic field gradient measurement
Assignee: Shell Development Co
•
Filing: 1945-01-11
•
Granted: 1948-02-17
•
Expires: 1965-01-11
Abstract
No abstract record available.
Inventors
- 👤 Charles H Fay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:52
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1863415A
Cited
US1831744A
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GB397167A
Cited
US2054672A
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US2220788A
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US2123045A
Cited
US2151627A
Cited
US2407202A
Cited
US2379716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-02-16 | 1951-08-18 | 1952-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-02-16 | 1955-08-18 | 1956-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-02-16 | 1959-08-18 | 1960-02-17 | $7700.00 | Window Closed / Lapsed |