US3702235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the detection of hydrogen sulfide in drill bit cutting
Assignee: Cities Service Oil Co
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Filing: 1971-06-25
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Granted: 1972-11-07
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Expires: 1991-06-25
Abstract
Abstract DRILL BIT CUTTINGS ARE GROUND IN THE PRESENCE OF A BYDROXONIUM ION, SUBSEQUENTLY VACUUM FILTERED AND RINSED WITH DISTILLED WATER IN ORDER TO PROVIDE A FILTRATE. THE FILTRATE IS INTRODUCED INTO A FLASK CONTAINING A ZINC POWDER, UTILIZED IN COJUNCTION WITH HYDROGEN CHLORIDE TO PROVIDE A SWEEP GAS OF HYDROGEN, IN ORDER TO EVOLVE HYDROGEN SULFIDE WHICH IS THEN QUALITATIVELY AND QUANTITATIVELY DETECTED. THE PROCESS ALLOWS TESTING OF CUTTINGS OF WATER OR OIL BASE MUDS TO YIELD ACCURATE DETERMINATIONS OF AMOUNT OF HYDROGEN SULFIDE ORIGINALLY PRESENT IN THE DRILL BIT CUTTINGS.
Inventors
- 👤 Wayne S Fallgatter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:53
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/24; G01N31/00; G01N31/02; Y; Y10; Y10S; Y10S436/00; Y10S436/908; Y10T; Y10T436/00; Y10T436/18; Y10T436/182; Y10T436/184
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |