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Patent US4671907A successfully refreshed from Google Patents.
US4671907A
Expired / Lapsed
US
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Method of manufacturing carbon materials
Assignee: Nippon Steel Corp
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Filing: 1985-08-06
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Granted: 1987-06-09
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Expires: 2005-08-06
Abstract
Abstract A method for the manufacture of high-strength, high-density carbon materials is disclosed. The method comprises the steps of pulverizing a carbonaceous raw material having a carbon content of at least 92% by weight, a volatile content of 7-20% by weight up to 900 DEG C., and linear shrinkage as a molded body of at most 6% during heating up to 500 DEG C. to an average particle diameter of greater than 10 mu m and at most 40 mu m, followed by molding and baking. An organic fiber after baking in an inert atmosphere at a temperature of at least 400 DEG C. may be mixed with the pulverized carbonaceous raw material.
Inventors
- 👤 Tohru Iwahashi
- 👤 Yoshihiko Sunami
- 👤 Tadashi Miyamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:22
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/71; C04B35/78; C04B35/80; C04B35/83
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
A method for the manufacture of high-strength, high-density carbon materials comprising the steps of: pulverizing a carbonaceous raw material to give a carbon powder having a carbon content of at least 92% by weight, a volatile content of 7-20% by weight up to 900° C., and linear shrinkage as a molded body of at most 6% during heating up to 500° C. to an average particle diameter of greater than 10 μm and at most 40 μm, followed by molding and baking.
Claim 2
Independent Claim
82 words
A method for the manufacture of high-strength, high-density carbon materials comprising the steps of: pulverizing a carbonaceous raw material to give a carbon powder having a carbon content of at least 92% by weight, a volatile content of 7-20% by weight up to 900° C., and linear shrinkage as a molded body of at most 6% during heating up to 500° C. to an average particle diameter of greater than 10 μm and at most 40 μm, followed by molding and baking.
Claim 3
Dependent Claim
15 words
A method as claimed in claim 1, wherein said volatile content is 7-13% by weight.
Claim 4
Dependent Claim
44 words
A method as claimed in claim 1, wherein said carbonaceous raw material is obtained by heating coal tar pitch under a reduced pressure of 10-70 Torr to 400°-530° C., increasing the carbon content, and eliminating the low molecular weight component and the decomposed component.
Claim 5
Dependent Claim
52 words
A method as claimed in claim 1, wherein said carbonaceous raw material is obtained by heat treating coal tar pitch under atmospheric pressure, followed by eluting and adjusting the volatile content with an aromatic solvent selected from the group consisting of benzene, toluene, xylene, decrystallized napthalene oil, decrystallized anthracene, and unrefined benzene.
Claim 6
Independent Claim
117 words
A method for the manufacture of high-strength, high-density carbon materials comprising the steps of: baking an organic fiber in an inert gas atmosphere at a temperature of at least 400° C.; blending said organic fiber with a carbon powder having a carbon content of at least 92% by weight, a volatile content up to 900° C. of 7-20% by weight, linear shrinkage as a molded body of at most 6% during heating up to 500° C., and an average particle diameter of at most 40 μm; molding without using a binder; and after said molding step, baking so as to obtain a high-strength, high-density carbon material with a bending strength of at least 700 kg/cm 2 .
Claim 7
Independent Claim
117 words
A method for the manufacture of high-strength, high-density carbon materials comprising the steps of: baking an organic fiber in an inert gas atmosphere at a temperature of at least 400° C.; blending said organic fiber with a carbon powder having a carbon content of at least 92% by weight, a volatile content up to 900° C. of 7-20% by weight, linear shrinkage as a molded body of at most 6% during heating up to 500° C., and an average particle diameter of at most 40 μm; molding without using a binder; and after said molding step, baking so as to obtain a high-strength, high-density carbon material with a bending strength of at least 700 kg/cm 2 .
Claim 8
Dependent Claim
52 words
A method as claimed in claim 5, wherein said organic fiber is a fiber having a synthetic high polymer resin selected from polyacrylonitrile, rayon, a phenolic resin, and a pitch-type fiber having petroleum pitch or coal pitch as a raw material, said organic fiber having been baked in an inert gas atmosphere.
Claim 9
Dependent Claim
18 words
A method as claimed in claim 6, wherein said organic fiber has previously undergone treatment to prevent fusion.
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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) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |