US4975405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrated silica gel for stabilization treatment of beer
Assignee: Fuji-Davison Chemical Ltd
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Filing: 1986-09-12
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Granted: 1990-12-04
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Expires: 2006-09-12
Abstract
Abstract There is provided by this invention a finely divided hydrated silica gel which has a specific surface area of 530 -720 m 2 /g, preferably 550-650 m 2 /g, a pore volume of 0.9-1.5 ml/g, preferably 1.0-1.4 ml/g, a mean pore diameter of 50-120 Å, preferably 60-100 Å, a water content of 7-25% by weight, preferably 8-13% by weight (wet weight basis), and moreover the pH of which as a 5% aqueous suspension is 6.0-8.0, thereby producing a silica gel suitable for stabilization treatment of beer, and for reduction of the colloidal components in beer.
Inventors
- 👤 Katsutoshi Okamura
- 👤 Yasuo Esaki
- 👤 Koichi Matsuzawa
- 👤 Katsuhiko Asano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:13
CPC Classifications
C; C12; C12C; C12C7/00; C12C7/14; C12H; C12H1/00; C12H1/02; C12H1/04; C12H1/0408
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
A hydrated silica gel having a silica xerogel structure for a stabilizing treatment of beer, said silica gel having a specific surface area of 530-720 m 2 /g, a pore volume of 0.9-1.5 ml/g, a mean pore diameter of 50-120 Å, a water content of 7-25% by weight (wet weight basis) and a pH of 6.0-8.0 as a 5% aqueous suspension.
Claim 2
Dependent Claim
61 words
A hydrated silica gel having a silica xerogel structure for a stabilizing treatment of beer, said silica gel having a specific surface area of 530-720 m 2 /g, a pore volume of 0.9-1.5 ml/g, a mean pore diameter of 50-120 Å, a water content of 7-25% by weight (wet weight basis) and a pH of 6.0-8.0 as a 5% aqueous suspension.
Claim 3
Dependent Claim
24 words
The hydrated silica gel according to claim 1, wherein said silica gel, in a hydrated state of colloidal particles, has a three-dimensional network structure.
Claim 4
Dependent Claim
21 words
The hydrated silica gel according to claim 2, wherein said silica gel has an activity of water value less than 0.62.
Claim 5
Dependent Claim
52 words
The hydrated silica gel having a silica xerogel structure according to claim 1, wherein said specific surface area ranges from 550-650 m 2 /g, said pore volume ranges from 1.0-1.4 ml/g, said mean pore diameter ranges from 60-100 Å and said water content ranges from 8-13% by weight on a wet basis.
Claim 6
Dependent Claim
63 words
A hydrated silica gel for stabilizing beer, said silica gel having a specific surface area of 530-720 m 2 /g, a pore volume of 0.9-1.5 ml/g, a mean pore diameter of 50-120Å, a water content of 7-25% by weight (wet weight basis), a pH of 6.0-8.0, as a 5% aqueous suspension, and a saturated ammonium sulfate precipitation limit ranging from 90.0 to 102.4.
Claim 7
Dependent Claim
63 words
A hydrated silica gel for stabilizing beer, said silica gel having a specific surface area of 530-720 m 2 /g, a pore volume of 0.9-1.5 ml/g, a mean pore diameter of 50-120Å, a water content of 7-25% by weight (wet weight basis), a pH of 6.0-8.0, as a 5% aqueous suspension, and a saturated ammonium sulfate precipitation limit ranging from 90.0 to 102.4.
Claim 8
Dependent Claim
84 words
A hydrated silica gel having a xerogel structure and a specific surface area of 530-720 m 2 /g, a pore volume of 0.9-1.5 ml/g, a mean pore diameter of 50-120 Å, a water content of 7-25% by weight (wet weight basis) and a pH of which a 5% aqueous suspension is 6.0 to 8.0, prepared by a process comprising: preparing a silica hydrogel; and drying said silica hydrogel while the water content of the silica is controlled within the range of 7-25% by weight.
Claim 9
Dependent Claim
84 words
A hydrated silica gel having a xerogel structure and a specific surface area of 530-720 m 2 /g, a pore volume of 0.9-1.5 ml/g, a mean pore diameter of 50-120 Å, a water content of 7-25% by weight (wet weight basis) and a pH of which a 5% aqueous suspension is 6.0 to 8.0, prepared by a process comprising: preparing a silica hydrogel; and drying said silica hydrogel while the water content of the silica is controlled within the range of 7-25% by weight.
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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) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |