US4497728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive pyrolytic product and composition using same
Assignee: Panasonic Holdings Corp
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Filing: 1983-05-19
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Granted: 1985-02-05
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Expires: 2003-05-19
Abstract
Abstract A conductive pyrolytic product obtained by thermally treating specific types of heat-resistant polymers including polyamide-imide, an aromatic polymer having a heterocyclic ring of a specific type and an aromatic polyamide under certain temperature and atmospheric conditions. A conductive composition using the pyrolytic product in the form of a powder is also disclosed.
Inventors
- 👤 Susumu Yoshimura
- 👤 Mutsuaki Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:10
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/08; C08G73/0683; C08G73/0688; C08G73/10; C08G73/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
70 words
A conductive composition comprising 10 to 50 weight percent of a film-forming polymer binder and a balance of a powder of a pyrolytic product obtained by thermally treating polyoxadiazole at a temperature ranging from 600° C. to 1000° C. in vacuo or in an inert atmosphere, the thermal treatment being maintained for a time sufficient to provide a pyrolytic product having a specific resistance of 10 -1 ohm-cm or below.
Claim 2
Dependent Claim
70 words
A conductive composition comprising 10 to 50 weight percent of a film-forming polymer binder and a balance of a powder of a pyrolytic product obtained by thermally treating polyoxadiazole at a temperature ranging from 600° C. to 1000° C. in vacuo or in an inert atmosphere, the thermal treatment being maintained for a time sufficient to provide a pyrolytic product having a specific resistance of 10 -1 ohm-cm or below.
Claim 3
Dependent Claim
16 words
A conductive composition according to claim 1, wherein said powder is in the form of flakes.
Claim 4
Dependent Claim
59 words
A conductive composition according to claim 1, wherein prior to the thermal treatment, the polymer is mixed in a solvent with carbon black or graphite of a powder form, formed into a film or sheet and thermally treated, and the treated film or sheet is powdered, whereby the carbon black or graphite powder is covered with the pyrolytic polymer.
Claim 5
Dependent Claim
12 words
A conductive composition according to claim 1, further comprising a metallic powder.
Claim 6
Dependent Claim
24 words
A conductive composition according to claim 4, wherein the amount of the metallic powder is sufficient to lower the sheet resistivity below 1 ohm/□.
Claim 7
Dependent Claim
14 words
A conductive composition according to claim 4, wherein said metallic powder is silver powder.
Claim 8
Dependent Claim
51 words
A conductive pyrolytic product obtained by thermally treating polyoxydiazole at a temperature ranging from 600° C. to 1000° C. in vacuo or in an inert gas atmosphere, the thermal treatment being maintained for a time sufficient to provide a pyrolytic product having a specific resistance of 10 -1 ohm-cm or below.
Claim 9
Dependent Claim
51 words
A conductive pyrolytic product obtained by thermally treating polyoxydiazole at a temperature ranging from 600° C. to 1000° C. in vacuo or in an inert gas atmosphere, the thermal treatment being maintained for a time sufficient to provide a pyrolytic product having a specific resistance of 10 -1 ohm-cm or below.
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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) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |