Patent US4761272A successfully refreshed from Google Patents.
US4761272A
Expired / Lapsed
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Densified carbonaceous bodies with improved surface finishes
Assignee: Union Oil Company of California
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Filing: 1985-07-29
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Granted: 1988-08-02
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Expires: 2005-07-29
Abstract
Abstract A liquid impregnant containing furfural, an acid catalyst and a pore-forming agent comprising a surfactant, e.g. a polyalkylene oxide adduct, is impregnated into fine grained, isotropic graphite bodies and then polymerized and pyrolyzed. An increase in the density of the impregnated body and an improved surface finish is obtained by means of the liquid impregnant and method of this invention.
Inventors
- 👤 Edward E. Hucke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:43
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/521
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
94 words
A method of producing a densified carbonaceous body with a superior surface finish, said method comprising the steps of: impregnating a permeable body composed essentially of a fine grained, isotropic graphite with a liquid impregnant containing furfural or furfural alcohol or a mixture thereof, an acid catalyst, and a pore-forming agent comprising a polyalkylene oxide adduct nonionic surfactant; heating the impregnated, permeable body to a temperature which is sufficiently high to polymerize the impregnant; and then heating said body to a temperature which is sufficiently high to pyrolyze the carbon in the polymerized impregnant.
Claim 2
Independent Claim
94 words
A method of producing a densified carbonaceous body with a superior surface finish, said method comprising the steps of: impregnating a permeable body composed essentially of a fine grained, isotropic graphite with a liquid impregnant containing furfural or furfural alcohol or a mixture thereof, an acid catalyst, and a pore-forming agent comprising a polyalkylene oxide adduct nonionic surfactant; heating the impregnated, permeable body to a temperature which is sufficiently high to polymerize the impregnant; and then heating said body to a temperature which is sufficiently high to pyrolyze the carbon in the polymerized impregnant.
Claim 3
Dependent Claim
53 words
A method of producing a densified carbonaceous body as defined in claim 1 wherein the constituents of the liquid impregnant are present in the following proportions: ______________________________________
Furfural, furfural alcohol
40-85 Volume %
or mixture thereof
Acid catalyst 2-20 Weight %
of furfural,
furfural alcohol or
mixture thereof
Polyalkylene oxide adduct
Balance.
______________________________________
Claim 4
Independent Claim
37 words
A method of producing a densified carbonaceous body as defined in either of the preceding claims 1 or 2 wherein the acid catalyst constituent of the liquid impregnant is a para toluene sulfonic, phosphoric, or hydrocholoric acid.
Claim 5
Independent Claim
30 words
A method of producing a densified carbonaceous body as defined in either of the preceding claims 1 or 2 wherein the pore-forming agent comprises a polyethylene oxide adduct nonionic surfactant.
Claim 6
Dependent Claim
30 words
A method of producing a densified carbonaceous body as defined in claim 4 wherein the pore-forming agent of the liquid impregnant is a polyethylene oxide adduct of an alkyl phenol.
Claim 7
Dependent Claim
66 words
A densified carbonaceous artifact with a superior surface finish, said artifact comprising: a permeable body composed essentially of a fine grained, isotropic graphite, the pores of said body being filled with the pyrolyzation product of a resin obtained by polymerizing an impregnant containing furfural, or furfural alcohol or a mixture thereof, an acid catalyst, and a liquid pore-forming agent comprising a polyalkylene oxide adduct nonionic surfactant.
Claim 8
Dependent Claim
66 words
A densified carbonaceous artifact with a superior surface finish, said artifact comprising: a permeable body composed essentially of a fine grained, isotropic graphite, the pores of said body being filled with the pyrolyzation product of a resin obtained by polymerizing an impregnant containing furfural, or furfural alcohol or a mixture thereof, an acid catalyst, and a liquid pore-forming agent comprising a polyalkylene oxide adduct nonionic surfactant.
Claim 9
Dependent Claim
49 words
A densified carbonaceous body as defined in claim 6 wherein the constituents of the liquid impregnant are present in the following proportions: ______________________________________
Furfural, furfural alcohol
40-85 Volume %
or mixture thereof
Acid catalyst 2-20 Weight %
of furfural,
furfural alcohol or
mixture thereof
Polyalkylene oxide adduct
Balance.
______________________________________
Claim 10
Dependent Claim
32 words
A densified carbonaceous body as defined in either of the preceding claims 6 or 7 wherein the acid catalyst constituent of the liquid impregnant is para toluene sulfonic, phosphoric, or hydrochloric acid.
Claim 11
Dependent Claim
30 words
A densified carbonaceous body as defined in either of the preceding claims 6 or 7 wherein the pore-forming agent of the liquid impregnant comprises a polyethylene oxide adduct nonionic surfactant.
Claim 12
Dependent Claim
26 words
A densified carbonaceous body as defined in claim 9 wherein the pore-forming agent constituent of the liquid impregnant is a polyethylene oxide adduct of an alkylphenol.
Claim 13
Independent Claim
102 words
A method of producing a densified carbonaceous body with a superior surface finish, said method comprising the steps of: impregnating a permeable body composed essentially of a fine grained, isotropic graphite with a liquid impregnant containing furfural or furfural alcohol or a mixture thereof, an acid catalyst, and a pore-forming agent comprising a surfactant selected from the group consisting of anionic, cationic, nonionic and amphoteric surfactants; heating the impregnated, permeable body to a temperature which is sufficiently high to polymerize the impregnant; and then heating said body to a temperature which is sufficiently high to pyrolyze the carbon in the polymerized impregnant.
Claim 14
Independent Claim
102 words
A method of producing a densified carbonaceous body with a superior surface finish, said method comprising the steps of: impregnating a permeable body composed essentially of a fine grained, isotropic graphite with a liquid impregnant containing furfural or furfural alcohol or a mixture thereof, an acid catalyst, and a pore-forming agent comprising a surfactant selected from the group consisting of anionic, cationic, nonionic and amphoteric surfactants; heating the impregnated, permeable body to a temperature which is sufficiently high to polymerize the impregnant; and then heating said body to a temperature which is sufficiently high to pyrolyze the carbon in the polymerized impregnant.
Claim 15
Dependent Claim
74 words
A densified carbonaceous artifact with a superior surface finish, said artifact comprising: a permeable body composed essentially of a fine grained, isotropic graphite, the pores of said body being filled with the pyrolyzation product of a resin obtained by polymerizing an impregnant containing furfural, or furfural alcohol or a mixture thereof, an acid catalyst, and a liquid pore-forming agent comprising a surfactant selected from the group consisting of anionic, cationic, nonionic and amphoteric surfactants.
Claim 16
Dependent Claim
74 words
A densified carbonaceous artifact with a superior surface finish, said artifact comprising: a permeable body composed essentially of a fine grained, isotropic graphite, the pores of said body being filled with the pyrolyzation product of a resin obtained by polymerizing an impregnant containing furfural, or furfural alcohol or a mixture thereof, an acid catalyst, and a liquid pore-forming agent comprising a surfactant selected from the group consisting of anionic, cationic, nonionic and amphoteric surfactants.
Claim 17
Dependent Claim
24 words
A densified carbonaceous body having an average pore size of from 0.01 to 0.15 micron, and a closed porosity of less than 50 percent.
Claim 18
Dependent Claim
24 words
A densified carbonaceous body having an average pore size of from 0.01 to 0.15 micron, and a closed porosity of less than 50 percent.
Claim 19
Dependent Claim
14 words
The body of claim 13 having an average pore size of about 0.04 microns.
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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) | 1991-08-02 | 1992-02-01 | 1992-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-02 | 1996-02-01 | 1996-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-02 | 2000-02-01 | 2000-08-02 | $7700.00 | Window Closed / Lapsed |