US5094829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced precipitated silica
Assignee: PPG Industries Ohio Inc
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Filing: 1990-06-21
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Granted: 1992-03-10
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Expires: 2010-06-21
Abstract
Abstract Reinforced precipitated silica having, on a coating-free and impregnant-free basis, a surface area of from about 220 to about 340 square meters per gram, a pore diameter at the maximum of the volume pore size distribution function of from about 9 to about 20 nanometers, and a total intruded volume of from about 2.6 to about 4.4 cubic centimeters per gram, is produced by a process wherein precipitated silica is heavily reinforced using a multiplicity of precipitation and aging steps.
Inventors
- 👤 Thomas G. Krivak
- 👤 Timothy A. Okel
- 👤 Melvin P. Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:52
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/187; C01B33/193; B; B82; B82Y; B82Y30/00; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3081; C01P; C01P2002/00; C01P2002/02; C01P2004/00; C01P2004/01; C01P2004/04; C01P2004/50; C01P2004/60; C01P2004/61; C01P2004/64; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/14; C01P2006/16; C01P2006/17; C01P2006/80; C01P2006/82; C01P2006/90
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
62 words
Reinforced amorphous precipitated silica having, on a coating-free and impregnant-free basis, a surface area of from about 220 to about 340 square meters per gram, a pore diameter at the maximum of the volume pore size distribution function of from about 9 to about 20 nanometers, and a total intruded volume of from about 2.6 to about 4.4 cubic centimeters per gram.
Claim 2
Dependent Claim
62 words
Reinforced amorphous precipitated silica having, on a coating-free and impregnant-free basis, a surface area of from about 220 to about 340 square meters per gram, a pore diameter at the maximum of the volume pore size distribution function of from about 9 to about 20 nanometers, and a total intruded volume of from about 2.6 to about 4.4 cubic centimeters per gram.
Claim 3
Dependent Claim
23 words
The reinforced amorphous precipitated silica of claim 1 wherein said surface area is from about 220 to about 300 square meters per gram.
Claim 4
Dependent Claim
23 words
The reinforced amorphous precipitated silica of claim 1 wherein said surface area is from about 220 to about 270 square meters per gram.
Claim 5
Dependent Claim
30 words
The reinforced amorphous precipitated silica of claim 1 wherein said pore diameter at the maximum of the volume pore size distribution function is from about 13 to about 18 nanometers.
Claim 6
Dependent Claim
24 words
The reinforced amorphous precipitated silica of claim 1 wherein said total intruded volume is from about 3 to about 4.4 cubic centimeters per gram.
Claim 7
Dependent Claim
20 words
The reinforced amorphous precipitated silica of claim 1 which contains less than about 0.5 percent by weight alkali metal salt.
Claim 8
Dependent Claim
20 words
The reinforced amorphous precipitated silica of claim 1 which contains less than about 0.2 percent by weight alkali metal salt.
Claim 9
Dependent Claim
11 words
The reinforced amorphous precipitated silica of claim 1 which is hydrophobic.
Claim 10
Dependent Claim
16 words
The reinforced amorphous precipitated silica of claim 8 which comprises silicone oil or condensation residue thereof.
Claim 11
Dependent Claim
48 words
The reinforced amorphous precipitated silica of claim 1 wherein: (a) said pore diameter at the maximum of the volume pore size distribution function is from about 13 to about 18 nanometers; and (b) said total intruded volume is from about 3 to about 4.4 cubic centimeters per gram.
Claim 12
Dependent Claim
23 words
The reinforced amorphous precipitated silica of claim 10 wherein said surface area is from about 220 to about 300 square meters per gram.
Claim 13
Dependent Claim
23 words
The reinforced amorphous precipitated silica of claim 10 wherein said surface area is from about 220 to about 270 square meters per gram.
References Cited (Backward Citations)
US2657149A
Cited
US2940830A
Cited
US4161455A
Cited
US4263051A
Cited
US4260454A
Cited
US4704425A
Cited
US4677141A
Cited
US4463108A
Cited
US4708859A
Cited
US4681750A
Cited
US4956167A
Cited
US4724167A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-10 | 1995-09-09 | 1996-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-10 | 1999-09-09 | 2000-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-10 | 2003-09-09 | 2004-03-10 | $7700.00 | Window Closed / Lapsed |