US3143887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Density meters
Assignee: Halliburton Co
•
Filing: 1959-12-14
•
Granted: 1964-08-11
•
Expires: 1979-12-14
Abstract
No abstract record available.
Inventors
- 👤 Don H Hathorn
- 👤 Forrest C Pittman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:58
CPC Classifications
G; G01; G01N; G01N9/00; G01N9/02; G01N9/04; G01N9/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US32159A
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US1138281A
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US1988527A
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US2137797A
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US2243265A
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DE865244C
Cited
US2719018A
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US2738993A
Cited
US2807480A
Cited
GB776926A
Cited
US2886066A
Cited
US3039310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |