Patent US4263268A successfully refreshed from Google Patents.
US4263268A
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Preparation of porous carbon
Assignee: Shandon Diagnostics Ltd
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Filing: 1979-11-20
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Granted: 1981-04-21
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Expires: 1999-11-20
Abstract
Abstract Porous carbon, suitable for instance for chromatography and as a catalyst support is formed by depositing carbon into the pores of a porous inorganic template such as silica gel, porous glass or a porous oxide, e.g. alumina, and thereafter removing the template as by dissolution or evaporation. Carbon is preferably deposited as a polymerizable organic material that is polymerized in situ in the template pores and then pyrolyzed to carbon.
Inventors
- 👤 John H. Knox
- 👤 Mary T. Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:09
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/30; B01J20/305; B01J20/3057; B01J20/02; B01J20/20; B01J21/00; B01J21/18
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
51 words
A method of producing porous carbon, comprising depositing carbon in the pores of a porous inorganic template material having a surface area of at least 1 m 2 g-1 and thereafter removing the template material to leave a porous carbon product having a geometry corresponding to that of the template material.
Claim 2
Independent Claim
51 words
A method of producing porous carbon, comprising depositing carbon in the pores of a porous inorganic template material having a surface area of at least 1 m 2 g-1 and thereafter removing the template material to leave a porous carbon product having a geometry corresponding to that of the template material.
Claim 3
Dependent Claim
20 words
The method of claim 1, in which said template material is selected from silica gel, porous glass and porous alumina.
Claim 4
Dependent Claim
22 words
The method of claim 2, in which said template material has a mean pore size in the range 3 to 2000 nm.
Claim 5
Dependent Claim
17 words
The method of claim 3, in which said template material has a porosity of at least 40%.
Claim 6
Dependent Claim
47 words
The method of claim 1, 2, 3 or 4, comprising contacting the template material with a polymerizable organic material that enters the pores of the template material, polymerizing said polymerizable organic material within said pores, and thereafter decomposing said polymerizable material to deposit carbon in said pores.
Claim 7
Dependent Claim
26 words
The method of claim 5, in which said polymerizable organic material is a liquid having molecules sufficiently small to enter the pores of the template material.
Claim 8
Dependent Claim
19 words
The method of claim 6, in which the said polymerizable organic material is a mixture of phenol and hexamine.
Claim 9
Dependent Claim
16 words
The method of claim 6, in which the said polymerizable organic material is a phenol-formaldehyde resole.
Claim 10
Dependent Claim
39 words
The method of claim 5, comprising contacting said template material with a solution of said polymerizable organic material and causing said solution to be absorbed into said pores, and thereafter eliminating the solvent of the absorbed solution by evaporation.
Claim 11
Dependent Claim
14 words
The method of claim 1, in which the template material is removed by dissolution.
Claim 12
Dependent Claim
14 words
The method of claim 5, in which the template material is removed by dissolution.
Claim 13
Dependent Claim
14 words
The method of claim 6, in which the template material is removed by dissolution.
Claim 14
Dependent Claim
14 words
The method of claim 1, in which the template material is removed by evaporation.
Claim 15
Dependent Claim
30 words
The method of claim 1, in which the porous carbon product is modified by after-treatment comprising depositing a layer of pyrocarbon on the internal surfaces of the porous carbon product.
Claim 16
Dependent Claim
30 words
The method of claim 5, in which the porous carbon product is modified by after-treatment comprising depositing a layer of pyrocarbon on the internal surfaces of the porous carbon product.
Claim 17
Dependent Claim
38 words
The method of claim 1, in which the porous carbon product is modified by after-treatment comprising heating the porous carbon product in an inert atmosphere at a temperature suitable to cause surface reorganization or graphitization of the carbon.
Claim 18
Dependent Claim
38 words
The method of claim 5, in which the porous carbon product is modified by after-treatment comprising heating the porous carbon product in an inert atmosphere at a temperature suitable to cause surface reorganization or graphitization of the carbon.
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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) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |