Patent US3384181A successfully refreshed from Google Patents.
US3384181A
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US
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Apparatus for detecting sand entrainment
Assignee: Union Oil Company of California
•
Filing: 1966-01-25
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Granted: 1968-05-21
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Expires: 1986-01-25
Abstract
No abstract record available.
Inventors
- 👤 George P Maly
- 👤 Jr George M Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:10
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/10; E21B43/00; E21B43/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2606793A
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US2696112A
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US3034912A
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US3070171A
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US3070166A
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US3075582A
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US3187567A
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US3220437A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-21 | 1971-11-20 | 1972-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-21 | 1975-11-20 | 1976-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-21 | 1979-11-20 | 1980-05-21 | $7700.00 | Window Closed / Lapsed |