Patent US4446079A successfully refreshed from Google Patents.
US4446079A
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Low cost, brine tolerant sulfonate and sulfate surfactants having 1,3-dihydrocarboxy-2-propyl hydrophobic tails
Assignee: Mobil Oil AS
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Filing: 1982-08-31
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Granted: 1984-05-01
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Expires: 2002-08-31
Abstract
Abstract Novel sulfonate and sulfate surfactants which have low interfacial tension at high salinity, and their use in enhanced oil recovery are disclosed. These surfactants may be made from relatively inexpensive intermediates, such as monohydric alcohols and epichlorohydrin. These surfactants have 1,3-dihydrocarboxy-2-propyl hydrophobic tails linked by ethoxy linkages to sulfate or alkyl sulfonate moieties.
Inventors
- 👤 Dennis H. Hoskin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:55
CPC Classifications
C; C07; C07C; C07C309/00; C09; C09K; C09K23/00; C09K23/02; C09K8/00; C09K8/58; C09K8/584; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
44 words
A compound of the formula ##STR13## where R 1 and R 2 are the same or different and are C 1 -C 15 hydrocarbyl, R 3 is C 0-5 alkyl, M is a cation and n is a rational number from 2 to 6.
Claim 2
Dependent Claim
44 words
A compound of the formula ##STR13## where R 1 and R 2 are the same or different and are C 1 -C 15 hydrocarbyl, R 3 is C 0-5 alkyl, M is a cation and n is a rational number from 2 to 6.
Claim 3
Dependent Claim
37 words
A compound according to claim 1, wherein R 1 and R 2 are C 4 -C 10 alkyl, R 3 is CH 2 CH 2 CH 2 and n is a rational number from 2 to 4.
Claim 4
Dependent Claim
31 words
A compound according to claim 2, wherein R 1 and R 2 are --CH 2 CH(C 2 H 5 )C 4 H 9 , M is Na and n is 3.2.
Claim 5
Dependent Claim
21 words
A compound according to claim 2, wherein R 1 and R 2 are n-hexyl, M is Na and n is 2.2.
Claim 6
Dependent Claim
30 words
A compound according to claim 2, wherein R 1 and R 2 are --CH 2 CH(C 2 H 5 )C 4 H 9 M is Na and n is 2.4.
Claim 7
Dependent Claim
31 words
A compound according to claim 2, wherein R 1 and R 2 are --CH 2 CH(C 2 H 5 )C 4 H 9 , M is Na and n is 3.6.
Claim 8
Dependent Claim
30 words
A compound according to claim 2, wherein R 1 and R 2 are --CH 2 CH(C 2 H 5 )C 4 H 9 M is Na and n is 3.0.
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) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |