Patent US4762626A successfully refreshed from Google Patents.
US4762626A
Expired / Lapsed
US
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Hydroxyethylacrylate/acrylate copolymers as zinc sulfide scale inhibitors
Assignee: ChampionX LLC
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Filing: 1987-04-03
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Granted: 1988-08-09
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Expires: 2007-04-03
Abstract
Abstract The utilization of hydroxyethylacrylate/acrylic acid copolymer as a zinc sulfide scale inhibitor in oil well production processes.
Inventors
- 👤 Daniel Emmons
- 👤 Gary R. Chesnut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:16
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/528; Y; Y10; Y10S; Y10S507/00; Y10S507/927
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
A method for inhibiting zinc sulfide scale in oil well operations, comprising introducing hydroxyethylacrylate/acrylate copolymer to oil flush water, said copolymer having a weight average molecular weight within the range of from 1,000 to 20,000.
Claim 2
Independent Claim
35 words
A method for inhibiting zinc sulfide scale in oil well operations, comprising introducing hydroxyethylacrylate/acrylate copolymer to oil flush water, said copolymer having a weight average molecular weight within the range of from 1,000 to 20,000.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said polymer is dosed at 2-100 ppm on an actives basis.
Claim 4
Dependent Claim
27 words
The method of claim 2 wherein said polymer has a molecular weight within the range of 2,000-6,000 and is dosed at 2-10 ppm on an actives basis.
References Cited (Backward Citations)
US3880765A
Cited
US4314044A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-09 | 1992-02-08 | 1992-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-09 | 1996-02-08 | 1996-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-09 | 2000-02-08 | 2000-08-09 | $7700.00 | Window Closed / Lapsed |