US4435375A
Expired / Lapsed
US
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Method for producing a carbon filament and derivatives thereof
Assignee: TAMURA SHOHEI C/O TOHDAI-SHOKUIN-SHUKUSHA
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Filing: 1981-09-04
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Granted: 1984-03-06
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Expires: 2001-09-04
Abstract
Abstract A novel type of carbon filaments grow from a purified graphite material when the purified graphite material is heated in a plasma. The carbon filaments thus obtained can be converted into softer graphite filaments. Both the carbon filaments and the graphite filaments as such are extremely useful due to their excellent mechanical strengths. In addition, from each of them, intercalation compounds with an alkali metal can be obtained, which are useful not only as a highly conductive material but also as a catalyst for various reactions.
Inventors
- 👤 Shohei Tamura
- 👤 Mizuka Sano
- 👤 Hiroo Inokuchi
- 👤 Koshiro Toriumi
- 👤 Naoki Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:11
CPC Classifications
B; B82; B82Y; B82Y30/00; B01; B01J; B01J21/00; B01J21/18; B01J35/00; B01J35/50; B01J35/58; D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/125; D01F9/00; D01F9/08; D01F9/12; D01F9/127; Y; Y10; Y10S; Y10S505/00; Y10S505/80; Y10S505/81
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
63 words
A method for producing a graphite filament which comprises purifying a graphite material, heating the resulting purified graphite material in a plasma having an electron temperature of at least 3,400° C. under a pressure of about 1 atm. to form a carbon filament, then subjecting the carbon filament to heat treatment at a temperature of at least 2,500° C. to effect graphitization thereof.
Claim 2
Independent Claim
63 words
A method for producing a graphite filament which comprises purifying a graphite material, heating the resulting purified graphite material in a plasma having an electron temperature of at least 3,400° C. under a pressure of about 1 atm. to form a carbon filament, then subjecting the carbon filament to heat treatment at a temperature of at least 2,500° C. to effect graphitization thereof.
Claim 3
Independent Claim
60 words
A method for producing an intercalation compound of a carbon filament with an alkaline metal which comprises purifying a graphite material, heating the resulting purified graphite material in a plasma having an electron temperature of at least 3,400° C. under a pressure of about 1 atm. to form a carbon filament, and reacting the carbon filament with an alkaline metal.
Claim 4
Independent Claim
60 words
A method for producing an intercalation compound of a carbon filament with an alkaline metal which comprises purifying a graphite material, heating the resulting purified graphite material in a plasma having an electron temperature of at least 3,400° C. under a pressure of about 1 atm. to form a carbon filament, and reacting the carbon filament with an alkaline metal.
Claim 5
Independent Claim
80 words
A method for producing an intercalation compound of a graphite filament with an alkaline metal which comprises purifying a graphite material, heating the resulting purified graphite material in a plasma having an electron temperature of at least 3,400° C. under a pressure of about 1 atm. to form a carbon filament, subjecting the carbon filament to heat treatment at a temperature of at least 2,500° C. to obtain a graphite filament in reacting the graphite filament with an alkaline metal.
Claim 6
Independent Claim
80 words
A method for producing an intercalation compound of a graphite filament with an alkaline metal which comprises purifying a graphite material, heating the resulting purified graphite material in a plasma having an electron temperature of at least 3,400° C. under a pressure of about 1 atm. to form a carbon filament, subjecting the carbon filament to heat treatment at a temperature of at least 2,500° C. to obtain a graphite filament in reacting the graphite filament with an alkaline metal.
Claim 7
Independent Claim
39 words
A method for producing a carbon filament which comprises purifying a graphite material and heating the resulting purified graphite material in a plasma having an electron temperature of at least 3,400° C. under a pressure of about 1 atm.
Claim 8
Independent Claim
39 words
A method for producing a carbon filament which comprises purifying a graphite material and heating the resulting purified graphite material in a plasma having an electron temperature of at least 3,400° C. under a pressure of about 1 atm.
Claim 9
Independent Claim
54 words
A method for producing a carbon filament which comprises purifying a graphite material and heating the resulting purified graphite material in a plasma having an electron temperature of at least 3,400° C. under a pressure of about 1 atm., wherein said purified graphite material has an iron content of about 80 ppm or less.
Claim 10
Independent Claim
54 words
A method for producing a carbon filament which comprises purifying a graphite material and heating the resulting purified graphite material in a plasma having an electron temperature of at least 3,400° C. under a pressure of about 1 atm., wherein said purified graphite material has an iron content of about 80 ppm or less.
Claim 11
Independent Claim
55 words
A method for producing a carbon filament which comprises purifying a graphite material and heating said purified graphite material in a plasma having an electron temperature of at least 3,400° C., to form a carbon filament therefrom, said purified graphite material being introduced into said plasma separately from any electrode used to produce said plasma.
Claim 12
Independent Claim
55 words
A method for producing a carbon filament which comprises purifying a graphite material and heating said purified graphite material in a plasma having an electron temperature of at least 3,400° C., to form a carbon filament therefrom, said purified graphite material being introduced into said plasma separately from any electrode used to produce said plasma.
Claim 13
Independent Claim
60 words
A method for producing a carbon filament which comprises purifying a graphite material and heating the resulting purified graphite material in a plasma having an electron temperature of at least 3,400° C. under a pressure of about 1 atm., said purified graphite material from which said filament is produced not forming part of any electrode used to produce said plasma.
Claim 14
Independent Claim
60 words
A method for producing a carbon filament which comprises purifying a graphite material and heating the resulting purified graphite material in a plasma having an electron temperature of at least 3,400° C. under a pressure of about 1 atm., said purified graphite material from which said filament is produced not forming part of any electrode used to produce said plasma.
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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |