US4523010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dihydroxypropyl mixed ether derivatives of cellulose
Assignee: Aqualon Co
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Filing: 1984-06-15
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Granted: 1985-06-11
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Expires: 2004-06-15
Abstract
Abstract Disclosed are nonionic dihydroxypropyl hydroxyalkylcelluloses having a dihydroxypropyl M.S. of from about 0.1 to 1.2 and a hydroxyalkyl M.S. of from about 1.5 to about 3.0. The dihydroxypropyl hydroxyalkylcelluloses are capable of reacting with polyvalent metal cations, such as, titanium and zirconium, in an aqueous medium, such as a salt brine medium, to form viscoelastic gels useful in oil recovery operations.
Inventors
- 👤 Carl Lukach
- 👤 Thomas G. Majewicz
- 👤 Albert R. Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:33
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/193; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/66; C09K8/68; C09K8/685; Y; Y10; Y10S; Y10S507/00; Y10S507/903; Y10S507/922
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
30 words
A nonionic, crosslinkable material consisting essentially of dihydroxypropyl hydroxyalkylcellulose having a dihydroxypropyl M.S. of from about 0.1 to 1.2 and a hydroxyalkyl M.S. of from about 1.5 to about 3.0.
Claim 2
Dependent Claim
30 words
A nonionic, crosslinkable material consisting essentially of dihydroxypropyl hydroxyalkylcellulose having a dihydroxypropyl M.S. of from about 0.1 to 1.2 and a hydroxyalkyl M.S. of from about 1.5 to about 3.0.
Claim 3
Dependent Claim
27 words
The material of claim 1 wherein the dihydroxypropyl M.S. is from about 0.5 to about 1.0 and the hydroxyalkyl M.S. is from about 2.0 to about 2.5.
Claim 4
Dependent Claim
29 words
A gel-forming composition consisting essentially of the material of claim 1 and a polyvalent metal cation selected from the group consisting of titanium and zirconium in an aqueous medium.
Claim 5
Dependent Claim
27 words
The composition of claim 3 wherein the polyvalent metal cation is in a form selected from the group consisting of a metal salt and a metal chelate.
Claim 6
Dependent Claim
29 words
A gel-forming composition consisting essentially of the material of claim 2 and a polyvalent metal cation selected from the group consisting of titanium and zirconium in an aqueous medium.
Claim 7
Dependent Claim
27 words
The composition of claim 5 wherein the polyvalent metal cation is in a form selected from the group consisting of a metal salt and a metal chelate.
Claim 8
Dependent Claim
30 words
A nonionic, crosslinkable material consisting essentially of dihydroxypropyl hydroxyethyl cellulose having a dihydroxypropyl M.S. of from about 0.1 to 1.2 and hydroxyethyl M.S. of from about 1.5 to about 3.0.
Claim 9
Dependent Claim
30 words
A nonionic, crosslinkable material consisting essentially of dihydroxypropyl hydroxyethyl cellulose having a dihydroxypropyl M.S. of from about 0.1 to 1.2 and hydroxyethyl M.S. of from about 1.5 to about 3.0.
Claim 10
Dependent Claim
27 words
The material of claim 7 wherein the dihydroxypropyl M.S. is from about 0.5 to about 1.0 and the hydroxyethyl M.S. is from about 2.0 to about 2.5.
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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |