US4882405A
Expired / Lapsed
US
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Terpolymers of acrylamide, alkylacrylamide and betaine monomers
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1988-10-19
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Granted: 1989-11-21
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Expires: 2008-10-19
Abstract
Abstract A water or brine soluble terpolymer having the structure: <IMAGE> wherein X is selected from the group consisting of <IMAGE> <IMAGE> and <IMAGE> wherein x is about 1 to about 95 mole percent; y is about 0.1 to about 5.0 mole percent; R1 is methyl or hydrogen; z is 1 to 29 mole percent; R2 is an alkyl group of 1-5 carbon atoms; R3 is an alkyl group of 3 to 4 carbon atoms; R4 is an alkyl group of 1-5 carbon atoms; and R5 is an alkyl group of 4-20.
Inventors
- 👤 Donald N. Schulz
- 👤 Ilan Duvdevani
- 👤 Jan Bock
- 👤 Enock Berluche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:16
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/52; C08F220/54; C08F220/56
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
97 words
A brine and water soluble terpolymer having the structure: ##STR9## wherein X is selected from the group consisting of ##STR10## wherein x is about 70 to about 95 mole percent; y is about 0.1 to about 5 mole percent, R 1 is methyl or hydrogen; z is about 1.0 to about 29.0 mole percent; R 2 is an alkyl group of 1-5 carbon atoms; R 3 is an alkyl group of 3 to 4 carbon atoms; R 4 is an alkyl group of 1-5 carbon atoms; and R 5 is an alkyl group of 4-20 carbon atoms.
Claim 2
Dependent Claim
97 words
A brine and water soluble terpolymer having the structure: ##STR9## wherein X is selected from the group consisting of ##STR10## wherein x is about 70 to about 95 mole percent; y is about 0.1 to about 5 mole percent, R 1 is methyl or hydrogen; z is about 1.0 to about 29.0 mole percent; R 2 is an alkyl group of 1-5 carbon atoms; R 3 is an alkyl group of 3 to 4 carbon atoms; R 4 is an alkyl group of 1-5 carbon atoms; and R 5 is an alkyl group of 4-20 carbon atoms.
Claim 3
Independent Claim
117 words
A method for increasing the viscosity of a water or a brine solution which comprises the step of dissolving in said solution a water soluble terpolymer having the structure: ##STR11## wherein X is selected from the group consisting of ##STR12## wherein X is about 70 to about 95 mole percent; y is about 0.1 to about 5.0 mole percent; R 1 is methyl or hydrogen; z is about 1.0 to about 29.0 mole percent; R 2 is an alkyl group of 1-5 carbon atoms; R 3 is an alkyl group of 3 to 4 carbon atoms; R 4 is an alkyl group of 1-5 carbon atoms; and R 5 is an alkyl group of 4-20 carbon atoms.
Claim 4
Independent Claim
117 words
A method for increasing the viscosity of a water or a brine solution which comprises the step of dissolving in said solution a water soluble terpolymer having the structure: ##STR11## wherein X is selected from the group consisting of ##STR12## wherein X is about 70 to about 95 mole percent; y is about 0.1 to about 5.0 mole percent; R 1 is methyl or hydrogen; z is about 1.0 to about 29.0 mole percent; R 2 is an alkyl group of 1-5 carbon atoms; R 3 is an alkyl group of 3 to 4 carbon atoms; R 4 is an alkyl group of 1-5 carbon atoms; and R 5 is an alkyl group of 4-20 carbon atoms.
References Cited (Backward Citations)
US4650848A
Cited
US4742135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |