Patent US3717486A successfully refreshed from Google Patents.
US3717486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed products of silica and manufacturing the same from silica gel
Assignee: SK Kaken Co Ltd
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Filing: 1970-11-23
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Granted: 1973-02-20
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Expires: 1990-11-23
Abstract
Abstract A method for manufacturing foamed product of silica from silica gel comprises prefiring silica gel at a temperature ranging from 500 to 900*C so as to obtain a prefired product which can be ignited with a loss of not more than 5 percent by weight, the silica gel having a specific surface area of at least 500 m2/g and being of a size not passing through an 80-mesh sieve and substantially free of adsorption water, and thereafter firing the prefired product at a temperature ranging from 1000 to 1450*C to effect foaming.
Inventors
- 👤 K Fukumoto
- 👤 T Nakamura
- 👤 K Kadota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:06
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/02; C03; C03B; C03B19/00; C03B19/08; C03C; C03C11/00; C03C11/007
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
93 words
A method for manufacturing foamed product of silica from silica gel which comprises prefiring silica gel at a temperature ranging from 500 to 900*C so as to obtain a prefired product which can be ignited with a loss of not more than 5 % by weight, the silica gel having a specific surface area of at least 500 m2/g and being of a size not passing through an 80-mesh sieve and substantially free of adsorption water, and thereafter firing the prefired product at a temperature ranging from 1000 to 1450*C to effect foaming.
Claim 2
Independent Claim
93 words
A method for manufacturing foamed product of silica from silica gel which comprises prefiring silica gel at a temperature ranging from 500 to 900*C so as to obtain a prefired product which can be ignited with a loss of not more than 5 % by weight, the silica gel having a specific surface area of at least 500 m2/g and being of a size not passing through an 80-mesh sieve and substantially free of adsorption water, and thereafter firing the prefired product at a temperature ranging from 1000 to 1450*C to effect foaming.
Claim 3
Dependent Claim
21 words
The method according to claim 1, in which said silica gel has a specific surface area of 600 to 900 m2/g.
Claim 4
Dependent Claim
24 words
The method according to claim 1, in which said silica gel passes through a 5-mesh sieve but do not pass through a 24-mesh sieve.
Claim 5
Dependent Claim
20 words
The method according to claim 1, in which silica gel is prefired at a temperature ranging from 550 to 750*C.
Claim 6
Dependent Claim
20 words
The method according to claim 1, in which said prefired product shows ignition loss of 0.5 to 2.5 weight percent.
Claim 7
Dependent Claim
21 words
The method according to claim 1, in which said prefired product is fired at a temperature ranging from 1100 to 1300*C.
Claim 8
Dependent Claim
20 words
The method according to claim 1, in which said prefiring temperature is raised to said firing temperature within 20 minutes.
Claim 9
Dependent Claim
22 words
The method according to claim 7, in which said period for raising the prefired temperature to fired temperature is within 10 minutes.
Claim 10
Dependent Claim
22 words
The method according to claim 1, in which said silica gel is impregnated with a coloring material to produce colored foamed product.
Claim 11
Dependent Claim
35 words
The method according to claim 9, in which said coloring material is at least one water-soluble salts of a metal selected from the group consisting of iron, cobalt, copper, zinc, chromium, manganese, nickel and lead.
Claim 12
Dependent Claim
29 words
The method according to claim 1, in which said silica gel is impregnated with a flux and pre-fired at 450 to 800*C and then fired at 900 to 1450*C.
Claim 13
Dependent Claim
31 words
The method according to claim 11, in which said flux is at least one species selected from the group consisting of a water-soluble alkali metal salt and a water-soluble boron compound.
Claim 14
Dependent Claim
19 words
The method according to claim 11, in which said firing temperature is in the range of 1000 to 1150*C.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |