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US4332856A
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Carbon or graphite article and method of making by impregnating with a lignin sulfonate complex
Assignee: GREAT LAKES CARBON Corp
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Filing: 1980-09-29
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Granted: 1982-06-01
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Expires: 2000-09-29
Abstract
Abstract In a process for producing carbon or graphite articles, baked carbonaceous articles are impregnated with an aqueous solution of lignin sulfonate complex prior to carbonization or graphitization. The carcinogenic effects of conventional impregnants are eliminated, and impregnation temperatures are lowered significantly.
Inventors
- 👤 Harry L. Hsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:29
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/521; Y; Y10; Y10T; Y10T428/00; Y10T428/30; Y10T428/31504; Y10T428/31971; Y10T428/31975
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
62 words
In a process for producing a carbon or graphite article by forming a mixture of carbon filler and carbonaceous binder, baking the formed mixture to produce a carbon body, impregnating the carbon body with an impregnation agent, and carbonizing or graphitizing the impregnated carbon body, the improvement wherein said impregnation agent consists essentially of an aqueous solution of a lignin sulfonate complex.
Claim 2
Dependent Claim
62 words
In a process for producing a carbon or graphite article by forming a mixture of carbon filler and carbonaceous binder, baking the formed mixture to produce a carbon body, impregnating the carbon body with an impregnation agent, and carbonizing or graphitizing the impregnated carbon body, the improvement wherein said impregnation agent consists essentially of an aqueous solution of a lignin sulfonate complex.
Claim 3
Dependent Claim
67 words
In a process for producing a graphite article by forming a mixture of coke filler and carbonaceous binder, baking the formed mixture to produce a carbon body, impregnating the carbon body with an impregnation agent, rebaking the impregnated body to carbonize the impregnant and graphitizing the rebaked impregnated carbon body, the improvement wherein said impregnation agent consists essentially of an aqueous solution of a lignin sulfonate complex.
Claim 4
Dependent Claim
67 words
In a process for producing a graphite article by forming a mixture of coke filler and carbonaceous binder, baking the formed mixture to produce a carbon body, impregnating the carbon body with an impregnation agent, rebaking the impregnated body to carbonize the impregnant and graphitizing the rebaked impregnated carbon body, the improvement wherein said impregnation agent consists essentially of an aqueous solution of a lignin sulfonate complex.
Claim 5
Dependent Claim
61 words
In a process for producing a graphite article by forming a mixture of carbon filler and carbonaceous binder, baking the formed mixture to produce a carbon body, graphitizing the carbon body, impregnating the graphitized body with an impregnation agent and carbonizing the impregnated body, the improvement wherein the impregnation agent consists essentially of an aqueous solution of a lignin sulfonate complex.
Claim 6
Dependent Claim
61 words
In a process for producing a graphite article by forming a mixture of carbon filler and carbonaceous binder, baking the formed mixture to produce a carbon body, graphitizing the carbon body, impregnating the graphitized body with an impregnation agent and carbonizing the impregnated body, the improvement wherein the impregnation agent consists essentially of an aqueous solution of a lignin sulfonate complex.
Claim 7
Dependent Claim
13 words
A process according to claim 3 wherein the impregnated graphitized body is regraphitized.
Claim 8
Dependent Claim
25 words
A process according to claims 1, 2, 3 or 4 wherein said impregnation agent consists essentially of an aqueous solution of ammonium lignin sulfonate complex.
Claim 9
Dependent Claim
25 words
A process according to claims 1, 2, 3 or 4 wherein said impregnation agent consists essentially of an aqueous solution of calcium lignin sulfonate complex.
Claim 10
Dependent Claim
29 words
A process according to claims 1, 2, 3 or 4 wherein said impregnation agent consists essentially of an aqueous solution containing about 40 to 60 wt. % dissolved solids.
Claim 11
Dependent Claim
27 words
A process according to claims 1, 2, 3 or 4 wherein said impregnation agent consists essentially of an aqueous solution containing about 50 wt. % dissolved solids.
Claim 12
Dependent Claim
65 words
In a process for producing a graphite article for forming a mixture of coke filler and carbonaceous binder, baking the formed mixture to produce a carbon body, impregnating the carbon body with an impregnation agent, and graphitizing the impregnated carbon body, the improvement wherein said impregnation agent consists essentially of an aqueous solution of ammonium lignin sulfonate complex containing about 50 wt. % dissolved solids.
Claim 13
Dependent Claim
65 words
In a process for producing a graphite article for forming a mixture of coke filler and carbonaceous binder, baking the formed mixture to produce a carbon body, impregnating the carbon body with an impregnation agent, and graphitizing the impregnated carbon body, the improvement wherein said impregnation agent consists essentially of an aqueous solution of ammonium lignin sulfonate complex containing about 50 wt. % dissolved solids.
Claim 14
Dependent Claim
39 words
A process for improving the properties of a carbon or graphite article comprising impregnating said article with an impregnating agent consisting essentially of an aqueous solution of a lignin sulfonate complex, and then carbonizing or graphitizing the impregnated article.
Claim 15
Dependent Claim
39 words
A process for improving the properties of a carbon or graphite article comprising impregnating said article with an impregnating agent consisting essentially of an aqueous solution of a lignin sulfonate complex, and then carbonizing or graphitizing the impregnated article.
Claim 16
Dependent Claim
58 words
A carbon or graphite article prepared by forming a mixture of carbon filler and carbonaceous binder, baking the formed mixture to produce a carbon body, impregnating the carbon body with an impregnation agent, and carbonizing or graphitizing the impregnated carbon body, the improvement wherein said impregnation agent consists essentially of an aqueous solution of a lignin sulfonate complex.
Claim 17
Dependent Claim
58 words
A carbon or graphite article prepared by forming a mixture of carbon filler and carbonaceous binder, baking the formed mixture to produce a carbon body, impregnating the carbon body with an impregnation agent, and carbonizing or graphitizing the impregnated carbon body, the improvement wherein said impregnation agent consists essentially of an aqueous solution of a lignin sulfonate complex.
Claim 18
Dependent Claim
61 words
A graphite article prepared by forming a mixture of coke filler and carbonaceous binder, baking the formed mixture to produce a carbon body, impregnating the carbon body with an impregnation agent, and graphitizing the impregnated carbon body, the improvement wherein said impregnation agent consists essentially of an aqueous solution of ammonium lignin sulfonate complex containing about 50 wt. % dissolved solids.
Claim 19
Dependent Claim
61 words
A graphite article prepared by forming a mixture of coke filler and carbonaceous binder, baking the formed mixture to produce a carbon body, impregnating the carbon body with an impregnation agent, and graphitizing the impregnated carbon body, the improvement wherein said impregnation agent consists essentially of an aqueous solution of ammonium lignin sulfonate complex containing about 50 wt. % dissolved solids.
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) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |