US4867613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of inorganic particles with polymer
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1987-11-12
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Granted: 1989-09-19
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Expires: 2007-11-12
Abstract
Abstract Dirt tracks and other surfaces formed of particulate material are stabilized, to suppress dust formation, by incorporating an aqueous solution of a water soluble, low molecular weight, anionic polymer.
Inventors
- 👤 Gloria McLeod
- 👤 Nicholas D. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:41
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/22; E; E21; E21F; E21F5/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
93 words
A process for stabilizing a surface formed of inorganic particulate material comprising providing an aqueous polymer solution consisting essentially of water and a water soluble anionic polymeric dispersant material that has a molecular weight of from 1,000 to 20,000 and that is formed from water soluble ethylenically unsaturated monomeric material or a water soluble blend of at least 50% ethylenically unsaturated anionic monomeric material with up to 50% ethylenically unsaturated non-ionic material, and stabilizing the surface by incorporating into the surface aqueous stabilizing material that consists essentially of the said aqueous polymer solution.
Claim 2
Dependent Claim
93 words
A process for stabilizing a surface formed of inorganic particulate material comprising providing an aqueous polymer solution consisting essentially of water and a water soluble anionic polymeric dispersant material that has a molecular weight of from 1,000 to 20,000 and that is formed from water soluble ethylenically unsaturated monomeric material or a water soluble blend of at least 50% ethylenically unsaturated anionic monomeric material with up to 50% ethylenically unsaturated non-ionic material, and stabilizing the surface by incorporating into the surface aqueous stabilizing material that consists essentially of the said aqueous polymer solution.
Claim 3
Dependent Claim
36 words
A process according to claim 1 in which the surface into which the aqueous stabilizing material has been incorporated is dried and subsequent stabilization of the surface is achieved by wetting the dried surface with water.
Claim 4
Dependent Claim
18 words
A process according to claim 1 in which the polymer has a molecular weight of 1,000 to 5,000.
Claim 5
Dependent Claim
36 words
A process according to claim 1 in which the polymer is formed from 50 to 100% by weight acrylic acid or water soluble salt thereof and 0 to 50% by weight lower alkyl acrylate or acrylamide.
Claim 6
Dependent Claim
21 words
A process according to claim 1 in which the polymer is sodium polyacrylate having a molecular weight of 1,500 to 10,000.
Claim 7
Dependent Claim
12 words
A process according to claim 1 in which the surface is static.
Claim 8
Dependent Claim
14 words
A process according to claim 6 in which the surface is a dirt track.
Claim 9
Dependent Claim
26 words
A process according to claim 1 in which the aqueous solution of polymeric material is incorporated into the surface by spraying the surface with the solution.
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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) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |