US2552454A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring the rate of drilling fluid flow through a well
Assignee: ENGINEERING LAB Inc
•
Filing: 1945-05-10
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Granted: 1951-05-08
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Expires: 1965-05-10
Abstract
No abstract record available.
Inventors
- 👤 James W Pitcher
- 👤 Jr John T Callahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:02
CPC Classifications
G; G01; G01F; G01F3/00; G01F3/02; G01F3/04; G01F3/14; G01F3/16; E; E21; E21B; E21B47/00; E21B47/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE375186C
Cited
US1435237A
Cited
US1476289A
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US2103077A
Cited
US2290179A
Cited
US2385772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |