Patent US4857622A successfully refreshed from Google Patents.
US4857622A
Expired / Lapsed
US
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Scale and settlement inhibiting agent for use in treating industrial and/or household water
Assignee: Coatex SAS
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Filing: 1987-09-30
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Granted: 1989-08-15
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Expires: 2007-09-30
Abstract
Abstract An agent to be used to treat water and aqueous media contacting heat transfer surfaces for inhibiting the build-up of scale and settlement of dissolved alkaline earth materials in water and aqueous media, which agent consists of acrylic and methacrylic acid polymers and/or copolymers and is characterized in that it comprises the fraction of said polymers and/or copolymers having a symmetrical, single-mode molecular weight distribution centered on an average molecular weight of about 800, in which 100% of said molecular weights are individually lower than 1,200 and at least 90% of same are in the 400-1,000 range.
Inventors
- 👤 Hubert Bousquet
- 👤 Georges Ravet
- 👤 Jacky Rousset
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:35
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
93 words
An agent for use in the treatment of water and aqueous media contacting heat transfer surfaces for inhibiting the build-up of scale and settlement of alkaline earth material consisting essentially of polymers of a monomer solely selected from the group consisting of acrylic acid and methacrylic acid, said polymers having 100% of their molecular weights lower than 1200 at least 90% of their molecular weights within the range of 400-1000, the distribution of molecular weights of said polymers being a symmetrical single-mode distribution and centered on an average molecular weight of about 800.
Claim 2
Dependent Claim
93 words
An agent for use in the treatment of water and aqueous media contacting heat transfer surfaces for inhibiting the build-up of scale and settlement of alkaline earth material consisting essentially of polymers of a monomer solely selected from the group consisting of acrylic acid and methacrylic acid, said polymers having 100% of their molecular weights lower than 1200 at least 90% of their molecular weights within the range of 400-1000, the distribution of molecular weights of said polymers being a symmetrical single-mode distribution and centered on an average molecular weight of about 800.
Claim 3
Dependent Claim
22 words
A scale and settlement inhibiting agent as claimed in claim 1 in which said polymers have a specific viscosity lower than 0.3.
Claim 4
Dependent Claim
22 words
A scale and settlement inhibiting agent as claimed in claim 1, in which said agent is in the form of a powder.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-14 | 1993-02-13 | 1993-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-14 | 1997-02-13 | 1997-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-14 | 2001-02-13 | 2001-08-15 | $7700.00 | Window Closed / Lapsed |