Patent US3693720A successfully refreshed from Google Patents.
US3693720A
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US
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Crude oil recovery method using a polymeric wax inhibitor
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1971-01-29
•
Granted: 1972-09-26
•
Expires: 1991-01-29
Abstract
Abstract The recovery of crude oil may be improved by inhibiting deposition of wax from the oil. Wax deposition may be inhibited by adding to the oil a polymer having pendant polar and non-polar moieties, such as a partially hydrolyzed ethylene-vinyl acetate copolymer.
Inventors
- 👤 Lee A Mcdougall
- 👤 Albert Rossi
- 👤 Max J Wisotsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:44
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/524; Y; Y10; Y10S; Y10S507/00; Y10S507/927; Y10S507/929; Y10S507/931; Y10S585/00; Y10S585/949; Y10S585/95
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
15 words
The method claimed in claim 1 wherein said Y moiety is a hydrolyzed X moiety.
Claim 2
Dependent Claim
17 words
The method claimed in claim 2 wherein R is hydrogen, X is -CN and Y is -COOH.
Claim 3
Dependent Claim
29 words
The method claimed in claim 1 wherein X is a carboxylic acid ester moiety of a C1-8 acid, Y is a hydroxyl moiety, and R is a hydrogen atom.
Claim 4
Dependent Claim
17 words
The method claimed in claim 1 wherein said polymer is added as a mixture with inert diluent-solvent.
Claim 5
Dependent Claim
42 words
The method claimed in claim 5 wherein said inert diluent-solvent is selected from the group consisting of xylene, heavy aromatic naphtha, gas oil, and processing oil and is present in 5 to 50 parts by weight per part by weight of polymer.
Claim 6
Independent Claim
78 words
The method of recovering crude petroleum oil containing waxy components which comprises adding down an oil well, a wax deposit inhibiting amount of a polymer --CH2CHR-m -CH2CHX-n -Ch2CHY-p-q wherein X is a non-polar moiety, Y is a polar moiety, R is H, alkyl, aryl, aralkyl, or alkaryl moiety, m is 1.5-3, n is 0.1-0.8, p is 0.01-0.5, m/(m+n+p) is 0.65-0.97, p/(n+p) is 0.1-0.85, q is 2 to 500, and the molecular weight Mn of said polymer is 500-100,000.
Claim 7
Dependent Claim
30 words
The method claimed in claim 7 wherein the polymer is and m is 1.5-2.5, n is 0.2-0.5, p is 0.02-0.4, q is 10-50, and the molecular weight Mn is 1,500-4,000.
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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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |