US4425316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Densified carbonaceous bodies with improved surface finishes
Assignee: Union Oil Company of California
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Filing: 1981-09-25
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Granted: 1984-01-10
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Expires: 2001-09-25
Abstract
Abstract A liquid formulation containing furfural, para toluene sulfonic acid and tetraethylene glycol is impregnated into fine grained, isotropic graphite bodies and then polymerized and pyrolyzed. That increases the density of the impregnated body and improves its surface finish.
Inventors
- 👤 Edward E. Hucke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:16
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/521
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
87 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 glycol or mixture of glycols; 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 carbonized the polymerized impregnant.
Claim 2
Independent Claim
87 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 glycol or mixture of glycols; 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 carbonized the polymerized impregnant.
Claim 3
Dependent Claim
47 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 above mixture
Glycol Balance
______________________________________
Claim 4
Independent Claim
36 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 para toluene sulfonic, phosphoric, or hydrocholoric acid.
Claim 5
Independent Claim
33 words
A method of producing a densified carbonaceous body as defined in either of the preceding claims 1 or 2 wherein the glycol constituent of the liquid impregnant is a polyethylene or polypropylene glycol.
Claim 6
Dependent Claim
24 words
A method of producing a densified carbonaceous body as defined in claim 4 wherein the glycol constituent of the liquid impregnant is tetraethylene glycol.
Claim 7
Dependent Claim
60 words
A structure which is capable of being converted into a densified carbonaceous artifact, said structure being composed of a body which is essentially a fine grained, isotropic carbon with the pores thereof filled with a liquid impregnant containing furfural and/or furfural alcohol, and acid polymerization catalyst, and one or more glycols or the polymerization products of an impregnant as aforesaid.
Claim 8
Dependent Claim
60 words
A structure which is capable of being converted into a densified carbonaceous artifact, said structure being composed of a body which is essentially a fine grained, isotropic carbon with the pores thereof filled with a liquid impregnant containing furfural and/or furfural alcohol, and acid polymerization catalyst, and one or more glycols or the polymerization products of an impregnant as aforesaid.
Claim 9
Dependent Claim
50 words
A structure as defined in claim 6 and capable of being converted into a densified carbonaceous body wherein the constituents of the impregnant are present in the following proportions: ______________________________________
Furfural, furfural alcohol,
40-85 Volume %
or mixture thereof
Acid Catalyst 2-20 Weight % of above mixture
Glycol Balance
______________________________________
Claim 10
Dependent Claim
39 words
A structure as defined in either of the preceding claims 6 or 7 and capable of being converted into a densified carbonaceous body wherein the acid catalyst constituent of the impregnant is para toluene sulfonic, phosphoric, or hydrochloric acid.
Claim 11
Dependent Claim
36 words
A structure as defined in either of the preceding claims 6 or 7 and capable of being converted into a desified carbonaceous body wherein the glycol constituent of the impregnant is a polyethylene or polypropylene glycol.
Claim 12
Dependent Claim
28 words
A structure as defined in claim 9 and capable of being converted into a densified carbonaceous body wherein the glycol constituent of the liquid impregnant is tetraethylene glycol.
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) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |