Patent US4637418A successfully refreshed from Google Patents.
US4637418A
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US
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Fluid friction reduction
Assignee: Henkel Corp
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Filing: 1984-10-25
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Granted: 1987-01-20
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Expires: 2004-10-25
Abstract
Abstract Liquid containing composition, and the transport of pumping thereof are disclosed, which compositions achieve maximum fluid friction reduction properties at low concentration of a drag reducing agent such as less than 0.015% by weight and preferably less than 0.01% by weight. The drag reducing agent is a polymer of 2-acrylamido-2-methylpropanesulfonic acid. Finely divided solids, such as coal, may be suspended therein.
Inventors
- 👤 Curtis L. Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:23
CPC Classifications
F; F17; F17D; F17D1/00; F17D1/08; F17D1/16; C; C10; C10L; C10L1/00; C10L1/32; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
58 words
In a method for transporting or pumping liquid compositions, the improvement wherein said liquid consists essentially of an alcohol and said liquid has dissolved therein a drag reducing polymer of 2-acrylamido-2-methylpropane sulfonic acid in an amount less than 0.015% by weight based on the weight of said liquid, said polymer having a molecular weight of at least 1,000,000.
Claim 2
Dependent Claim
58 words
In a method for transporting or pumping liquid compositions, the improvement wherein said liquid consists essentially of an alcohol and said liquid has dissolved therein a drag reducing polymer of 2-acrylamido-2-methylpropane sulfonic acid in an amount less than 0.015% by weight based on the weight of said liquid, said polymer having a molecular weight of at least 1,000,000.
Claim 3
Dependent Claim
18 words
A method as defined in claim 1 wherein said polymer has a molecular weight in excess of 5,000,000.
Claim 4
Dependent Claim
29 words
A method as defined in claim 1 wherein the polymer is present in an amount of from 0.015% to 0.003% by weight based on the weight of the liquid.
Claim 5
Dependent Claim
17 words
A method as defined in claim 1 wherein said liquid contains a finely divided solid suspended therein.
Claim 6
Dependent Claim
27 words
A method as described in claim 4 wherein the liquid also contains a member selected from the group consisting of an acid, a base and a salt.
Claim 7
Dependent Claim
32 words
A method as described in claim 5 wherein the polymer contains less than 10% by weight of a comonomer selected from the group consisting of: acrylamide, acrylic acid, methyl acrylate, and methacrylamide.
Claim 8
Dependent Claim
28 words
A method as defined in claim 4 wherein said finely divided solid is present in an amount of at least 40% by weight to provide a pumpable slurry.
Claim 9
Dependent Claim
14 words
A method as defined in claim 7 wherein said solid is a carbonaceous material.
Claim 10
Dependent Claim
19 words
A method as defined in claim 8 wherein said carbonaceous material is coal and said liquid is an alcohol.
Claim 11
Dependent Claim
12 words
A method as defined in claim 9 wherein said alcohol is methanol.
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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) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |