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Patent US2660800A successfully refreshed from Google Patents.
US2660800A
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Borehole hydraulic measuring apparatus
Assignee: Phillips Petroleum Co
•
Filing: 1950-01-04
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Granted: 1953-12-01
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Expires: 1970-01-04
Abstract
No abstract record available.
Inventors
- 👤 Bruce F Wiley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:07
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2267110A
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US2324865A
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US2324217A
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US2374154A
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US2392357A
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US2399305A
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US2446632A
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US2423609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |