US3687847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and process for inhibiting corrosion in oil wells
Assignee: Texaco Inc
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Filing: 1971-03-30
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Granted: 1972-08-29
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Expires: 1991-03-30
Abstract
Abstract AMIDE CONDENSATION PRODUCTS OF POLYMERIC ACID AND 1-AMINOALKYL-2-ALKYL-2-IMIDAZOLINE FOR USE IN COMPOSITIONS OF HEAVY LIQUID CORROSION INHIBITORS WHICH MAY CONTAIN WEIGHTING AGENTS SUCH AS POLYHYDRIC ALCOHOLS AND ALKYLENE CARBONATES. CONTINUOUS OR INTERMITTENT APPLICATION OF LIQUID COATINGS OF THESE INHIBITORS ON METALS, PARTICULARLY FERROUS METALS, IN CONTACT WITH SWEET AND SOUR PETROLIFEROUS WELL FLUIDS, FORM PERSISTENT FILMS WHICH AFFORD EFFECTIVE PROTECTION AGAINST CORROSION, EVEN AT ELEVATED TEMPERATURE, IN BRINE OR OIL AND BRINE MIXTURES.
Inventors
- 👤 Jim Maddox Jr
- 👤 William SCHOEN
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:08
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/54; C23; C23F; C23F11/00; C23F11/08; C23F11/10; Y; Y10; Y10S; Y10S507/00; Y10S507/939
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |