Patent US2698295A successfully refreshed from Google Patents.
US2698295A
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Combating ferrous metal corrosion
Assignee: Dow Chemical Co
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Filing: 1952-06-04
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Granted: 1954-12-28
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Expires: 1972-06-04
Abstract
No abstract record available.
Inventors
- 👤 Paul H Cardwell
- 👤 Charles L Lunsford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:48
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/16; C23F11/164; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
THE METHOD OF INHIBITING CORROSION OF THE FERROUS METAL PARTS OF DEEP WELLS BY FLUID ENTERING THE WELL FROM THE CONTIGUOUS EARTH FORMATIONS WHICH COMPRISES DEPOSITING IN THE WELL TO CONTACT THE FERROUS METAL PARTS THEREIN A CORROSION INHIBITING MIXTURE COMPRISING 2 TO 80 PER CENT BY WEIGHT OF AN ALKALI METAL ALKYLSULFONAMIDOACETATE HAVING THE FORMULA CNH2N+1-SO2NHCH2COOM IN WHICH N IS 12 TO 18 INCLUSIVE, AND M IS AN ALKALI METAL, AND FROM 2 TO 80 PER CENT OF A THIOUREA SELECTED FROM THE GROUP CONSISTING OF DIETHYL THIOUREA, DIPHEYL THIOUREA, DI-O-TOLYL THIOUREA, DIBUTYL THIOUREA.
Claim 2
Independent Claim
95 words
THE METHOD OF INHIBITING CORROSION OF THE FERROUS METAL PARTS OF DEEP WELLS BY FLUID ENTERING THE WELL FROM THE CONTIGUOUS EARTH FORMATIONS WHICH COMPRISES DEPOSITING IN THE WELL TO CONTACT THE FERROUS METAL PARTS THEREIN A CORROSION INHIBITING MIXTURE COMPRISING 2 TO 80 PER CENT BY WEIGHT OF AN ALKALI METAL ALKYLSULFONAMIDOACETATE HAVING THE FORMULA CNH2N+1-SO2NHCH2COOM IN WHICH N IS 12 TO 18 INCLUSIVE, AND M IS AN ALKALI METAL, AND FROM 2 TO 80 PER CENT OF A THIOUREA SELECTED FROM THE GROUP CONSISTING OF DIETHYL THIOUREA, DIPHEYL THIOUREA, DI-O-TOLYL THIOUREA, DIBUTYL THIOUREA.
References Cited (Backward Citations)
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US2523898A
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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) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |