US4357245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble copolymer and its preparation
Assignee: Sanofi Aventis Deutschland GmbH
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Filing: 1981-08-28
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Granted: 1982-11-02
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Expires: 2001-08-28
Abstract
Abstract Outstandingly suitable drilling mud additives are water soluble copolymers consisting essentially of a random distribution of (a) 5 to 95% by weight of units of the formula ##STR1## (b) 5 to 95% by weight of units of the formula ##STR2## and (c) 0 to 80% by weight of units of the formula ##STR3## wherein R 1 and R 2 are the same or different and each is hydrogen methyl or ethyl; and X.sup.⊕ is a cation.
Inventors
- 👤 Friedrich Engelhardt
- 👤 Ulrich Riegel
- 👤 Martin Hille
- 👤 Heinz Wittkus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:14
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: 3
Claim 1
Independent Claim
81 words
An aqueous drilling mud containing 0.5 to 40 kg/m 3 of a water-soluble copolymer consisting essentially of a random distribution of (a) 5 to 95% by weight of units of the formula ##STR10## (b) 5 to 95% by weight of units of the formula ##STR11## and (c) 0 to 80% by weight of units of the formula ##STR12## wherein R 1 and R 2 are the same or different and each is hydrogen, methyl or ethyl; and X.sup.⊕ is a cation.
Claim 2
Dependent Claim
81 words
An aqueous drilling mud containing 0.5 to 40 kg/m 3 of a water-soluble copolymer consisting essentially of a random distribution of (a) 5 to 95% by weight of units of the formula ##STR10## (b) 5 to 95% by weight of units of the formula ##STR11## and (c) 0 to 80% by weight of units of the formula ##STR12## wherein R 1 and R 2 are the same or different and each is hydrogen, methyl or ethyl; and X.sup.⊕ is a cation.
Claim 3
Dependent Claim
27 words
In the process of well drilling using a drilling mud, the improvement which comprises circulating in said well while drilling the drilling mud according to claim 1.
References Cited (Backward Citations)
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US3296126A
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US3692673A
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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) | 1985-11-01 | 1986-05-03 | 1986-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-01 | 1990-05-03 | 1990-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-01 | 1994-05-03 | 1994-11-02 | $7700.00 | Window Closed / Lapsed |