Patent US2740758A successfully refreshed from Google Patents.
US2740758A
Expired / Lapsed
US
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Drilling mud with quenched fluorescence
Assignee: Sinclair Refining Co
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Filing: 1954-12-10
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Granted: 1956-04-03
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Expires: 1974-12-10
Abstract
No abstract record available.
Inventors
- 👤 Carl F Cross
- 👤 Stephen J Wayo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:22
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32; Y; Y10; Y10S; Y10S507/00; Y10S507/907; Y10S507/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
A DRILLING FLUID COMPOSITION CONSISTING ESSENTIALLY OF A FLUORESCENT-COMPONENT-CONTAINING-OIL BASE DRILLING FLUID AND NITROBENZENE IN AN AMOUNT EQUAL TO THE QUANTITY NECESSARTY TO QUENCH THE FLUORESCENCE OF THE FLUID.
Claim 2
Dependent Claim
29 words
A DRILLING FLUID COMPOSITION CONSISTING ESSENTIALLY OF A FLUORESCENT-COMPONENT-CONTAINING-OIL BASE DRILLING FLUID AND NITROBENZENE IN AN AMOUNT EQUAL TO THE QUANTITY NECESSARTY TO QUENCH THE FLUORESCENCE OF THE FLUID.
References Cited (Backward Citations)
US2698833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |