US4876077A
Expired / Lapsed
US
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Process for producing graphite
Assignee: Japan Science and Technology Agency
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Filing: 1987-12-15
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Granted: 1989-10-24
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Expires: 2007-12-15
Abstract
Abstract A process for producing graphite includes heat treating, in an inert gas or in vacuo, at least one polymer selected from the group consisting of a polyphenyleneoxadiazole, polybenzothiazoles, a polybenzobisthiazole, a polybenzoxazole, a polybenzobisoxazole and a polythiazole, at a temperature of at least 1600 DEG C., preferably at least 2000 DEG C., for at least 30 minutes, preferably at least 60 minutes, to convert the polymer to a highly-graphitized graphite. The process produces almost perfect graphite in any shape, such as film-shaped for large-area graphite, fibrous or powdered.
Inventors
- 👤 Mutsuaki Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:18
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/20; D01F9/24; C; C01; C01B; C01B32/00; C01B32/20; C01B32/205; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/524; C01P; C01P2002/00; C01P2002/60
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
62 words
A process for producing graphite, which comprises heat treating a film-shaped polymer selected from the group consisting of poly (m-phenylene-1,3,4-oxadiazole), poly (p-phenylene-1,3,4-oxadiazole), polybenzothiazoles, a polybenzobisthiazole, a polybenzoxazole, a polybenzobisoxazole and a polythiazole in an inert gas atmosphere or in vacuo, at a temperature of at least 2500 ° C., for at least 30 minutes, and thereby converting the polymer to highly-graphitized graphite.
Claim 2
Dependent Claim
62 words
A process for producing graphite, which comprises heat treating a film-shaped polymer selected from the group consisting of poly (m-phenylene-1,3,4-oxadiazole), poly (p-phenylene-1,3,4-oxadiazole), polybenzothiazoles, a polybenzobisthiazole, a polybenzoxazole, a polybenzobisoxazole and a polythiazole in an inert gas atmosphere or in vacuo, at a temperature of at least 2500 ° C., for at least 30 minutes, and thereby converting the polymer to highly-graphitized graphite.
Claim 3
Dependent Claim
19 words
A process for producing graphite as defined in claim 1, wherein the polymer is heat treated under increased pressure.
Claim 4
Dependent Claim
15 words
A process as defined in claim 2, wherein the pressure is at least 2 kb.
Claim 5
Dependent Claim
15 words
A process as defined in claim 2, wherein the pressure is at least 5 kb.
Claim 6
Dependent Claim
37 words
A process for producing graphite as defined in claim 1, wherein the polymer is heat treated in the presence of an element belonging to one of the groups IVb through VIIb and VIII of the periodic table.
Claim 7
Dependent Claim
25 words
A process for producing graphite as defined in claim 5, wherein the element is present in an amount of between 2% and 20% by weight.
Claim 8
Dependent Claim
37 words
A process for producing graphite as defined in claim 2, wherein the polymer is heat treated in the presence of an element belonging to one of the groups IVb through VIIb and VIII of the periodic table.
Claim 9
Dependent Claim
17 words
A process as defined in claim 1, wherein the polymer is heat-treated for at least 60 minutes.
Claim 10
Dependent Claim
24 words
A process as defined in claim 1, wherein the polymer is selected from the group consisting of poly (m-phenylene-1,3,4-oxadiazole), poly (o-phenylene-1,3,4-oxadiazole), and poly (p-phenylene-1,3,4-oxadiazole).
Claim 11
Dependent Claim
24 words
A process as defined in claim 8, wherein the polymer is selected from the group consisting of poly (m-phenylene-1,3,4-oxadiazole), poly (o-phenylene-1,3,4-oxadiazole), and poly (p-phenylene-1,3,4-oxadiazole).
Claim 12
Dependent Claim
24 words
A process as defined in claim 1, wherein the polymer is selected from the group consisting of poly (m-phenylene-1,3,4-oxadiazole), poly (o-phenylene-1,3,4-oxadiazole), and poly (p-phenylene-1,3,4-oxadiazole).
Claim 13
Dependent Claim
24 words
A process as defined in claim 5, wherein the polymer is selected from the group consisting of poly (m-phenylene-1,3,4-oxadiazole), poly (o-phenylene-1,3,4-oxadiazole), and poly (p-phenylene-1,3,4-oxadiazole).
Claim 14
Dependent Claim
24 words
A process as defined in claim 7, wherein the polymer is selected from the group consisting of poly (m-phenylene-1,3,4-oxadiazole), poly (o-phenylene-1,3,4-oxadiazole), and poly (p-phenylene-1,3,4-oxadiazole).
Claim 15
Dependent Claim
13 words
A process as defined in claim 9 wherein the polymer is poly [p-phenylene-2,5-(1,3,4-oxadiazole)].
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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) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |