US3993497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating compositions containing precipitated silica
Assignee: JM Huber Corp
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Filing: 1975-02-13
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Granted: 1976-11-23
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Expires: 1995-02-13
Abstract
Abstract Silica products having very high structure as defined by the ability of the silica material to hold water in its wet cake, high oil absorption, and very high surface area can be produced by controlling the rate of acidulation during their production and maintaining the same at a very low rate during the course of the addition of acid to the solution of alkali metal silicate. The control of the index of refraction of the silica so produced is achieved by introduction of controlled amounts of adduct material such as aluminum sulfate to the acid prior to its introduction to the silicate solution.
Inventors
- 👤 Satish K. Wason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:58
CPC Classifications
A; A61; A61Q; A61Q11/00; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/25; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/187; C01B33/193; C09; C09D; C09D7/00; C09D7/40; C09D7/42; C01P; C01P2002/00; C01P2002/02; C01P2006/00; C01P2006/12; C01P2006/19; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
46 words
A coating composition containing a flatting agent, said flatting agent comprising an amorphous precipitated silica having very high structure, a wet cake moisture in excess of 85%, an oil absorption in excess of 200 ccs/100g, and a surface area in excess of 250 m 2 /g.
Claim 2
Dependent Claim
46 words
A coating composition containing a flatting agent, said flatting agent comprising an amorphous precipitated silica having very high structure, a wet cake moisture in excess of 85%, an oil absorption in excess of 200 ccs/100g, and a surface area in excess of 250 m 2 /g.
Claim 3
Dependent Claim
25 words
A composition according to claim 1 wherein said amorphous precipitated silica contains from about 3 to 10% by weight of a water soluble aluminum salt.
Claim 4
Dependent Claim
13 words
A composition according to claim 2 wherein the aluminum salt is aluminum sulfate.
References Cited (Backward Citations)
US3250594A
Cited
US3719741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |