US4544719A
Expired / Lapsed
US
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Water-soluble polymers containing 2-acrylamido-2-methylpropane-sulfonic acid, sodium salt (AMPS)-acrylamide-N,N-diallylacetamide
Assignee: ChampionX LLC
•
Filing: 1984-10-26
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Granted: 1985-10-01
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Expires: 2004-10-26
Abstract
Abstract Novel water-soluble terpolymers comprising: -Ingredients Mole % -2-acrylamido-2-methylpropane- 57-61 -sulfonic acid, sodium salt (AMPS) -acrylamide 20-35 -N,N-diallylacetamide 4-23 - These terpolymers provide high temperature fluid loss additives and rheology stabilizers for high calcium-containing brine clay drilling fluids.
Inventors
- 👤 David M. Giddings
- 👤 Donald G. Ries
- 👤 Allen R. Syrinek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:09
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24; C08; C08F; C08F220/00; C08F220/02; C08F220/52; C08F220/54; C08F220/58; C08F220/585
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
27 words
Novel water-soluble terpolymers having a molecular weight below 1,000,000 comprising: ______________________________________
Ingredients Mole %
______________________________________
2-acrylamido-2-methylpropane-
57-61
sulfonic acid, sodium salt (AMPS)
acrylamide 20-35
N,N--diallylacetamide 4-23
______________________________________
Claim 2
Dependent Claim
27 words
Novel water-soluble terpolymers having a molecular weight below 1,000,000 comprising: ______________________________________
Ingredients Mole %
______________________________________
2-acrylamido-2-methylpropane-
57-61
sulfonic acid, sodium salt (AMPS)
acrylamide 20-35
N,N--diallylacetamide 4-23
______________________________________
Claim 3
Dependent Claim
22 words
A novel water-soluble terpolymer comprising: ______________________________________
Ingredients Mole %
______________________________________
2-acrylamido-2-methylpropane-
58.4
sulfonic acid, sodium salt (AMPS)
acrylamide 32.5
N,N--diallylacetamide 09.1
______________________________________
Claim 4
Dependent Claim
22 words
A novel water-soluble terpolymer comprising: ______________________________________
Ingredients Mole %
______________________________________
2-acrylamido-2-methylpropane-
58.4
sulfonic acid, sodium salt (AMPS)
acrylamide 32.5
N,N--diallylacetamide 09.1
______________________________________
Claim 5
Dependent Claim
19 words
The novel water-soluble terpolymers of claim 1 wherein said terpolymers have a molecular weight within the range of 10,000-500,000.
References Cited (Backward Citations)
DE2836289A1
Cited
US4451631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |