US3423672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Terrestrial magnetism responsive device including fluid supported indicating means for investigating subsurface characteristics of the earth
Assignee: RAYMOND F STOCKTON
•
Filing: 1967-05-08
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Granted: 1969-01-21
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Expires: 1987-05-08
Abstract
No abstract record available.
Inventors
- 👤 Raymond F Stockton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:29
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; G01R; G01R33/00; G01R33/02; G01R33/038
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1940521A
Cited
US1971189A
Cited
US2234123A
Cited
US2261030A
Cited
US3183434A
Cited
US3334420A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |