Patent US4816338A successfully refreshed from Google Patents.
US4816338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glassy carbon-coated article
Assignee: Denka Co Ltd
•
Filing: 1987-05-12
•
Granted: 1989-03-28
•
Expires: 2007-05-12
Abstract
Abstract A glassy carbon-coated article contains a graphite substrate and a glassy carbon coating applied on the graphite substrate. The coating has a thickness of 15 to 200 microns. The glassy carbon is obtained by heating a raw material containing a thermal decomposition product of an organic polymer and a heat resistant inorganic substance. The difference of thermal expansion coefficient between the glassy carbon and the graphite substrate is not higher than 1.5×10 -6 /°C.
Inventors
- 👤 Ryuichi Terasaki
- 👤 Shinsei Sato
- 👤 Yoichi Ogata
- 👤 Kazumi Nozawa
- 👤 Yukihiko Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:11
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/524; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
A glassy carbon-coated article comprising a graphite substrate and a glassy carbon coating applied on said graphite substrate and having a thickness of 15 to 200 microns, said glassy carbon being obtained by heating a raw material containing a thermal decomposition product of an organic polymer and a carbonized product of said organic polymer, the carbon atom/hydrogen atom weight ratio of said thermal decomposition product being 10 to 25:1, said carbonized product of said organic polymer being contained in an amount by weight not higher than 5 times that of said thermal decomposition product, and the difference of thermal expansion coefficient between said glassy carbon and said graphite substrate being not higher than 1.5×10 -6 /°C.
Claim 2
Dependent Claim
116 words
A glassy carbon-coated article comprising a graphite substrate and a glassy carbon coating applied on said graphite substrate and having a thickness of 15 to 200 microns, said glassy carbon being obtained by heating a raw material containing a thermal decomposition product of an organic polymer and a carbonized product of said organic polymer, the carbon atom/hydrogen atom weight ratio of said thermal decomposition product being 10 to 25:1, said carbonized product of said organic polymer being contained in an amount by weight not higher than 5 times that of said thermal decomposition product, and the difference of thermal expansion coefficient between said glassy carbon and said graphite substrate being not higher than 1.5×10 -6 /°C.
Claim 3
Dependent Claim
40 words
A glassy carbon-coated article according to claim 1 wherein said organic polymer is selected from the group consisting of vinyl chloride resin, polyvinyl alcohol, oil-soluble phenol resin, alkyl phenol resin, chlorinated paraffin, chlorinated polypropylene, vinyl acetate resin and polycarbonate resin.
Claim 4
Dependent Claim
35 words
A glassy carbon-coated article according to claim 1 wherein said thermal decomposition product is obtained by heating for not less than 30 minutes in an inert atmosphere at a temperature of 200° to 500° C.
Claim 5
Dependent Claim
33 words
A glassy carbon-coated article according to claim 1 wherein said carbonized product is obtained by heating the organic polymer at a temperature not lower than 600° C. for not longer than two hours.
Claim 6
Dependent Claim
130 words
A process for the preparation of a glassy carbon-coated article comprising the steps of: dissolving a thermal decomposition product of an organic polymer in a solvent to produce a solution; adding a carbonized product of said organic polymer to said solution to form a slurry, said slurry containing 1 weight part of said thermal decomposition product and not higher than 5 weight parts of said carbonized product of said organic polymer; affixing said slurry to a graphite substrate having a difference in the thermal expansion coefficient from said glassy carbon of not higher than 1.5×10 -6 /°C., and heating said graphite substrate having said slurry affixed thereto at 600° C. to 1300° C. for not less than 30 minutes in an atmosphere selected from an inert atmosphere and a vacuum.
Claim 7
Dependent Claim
130 words
A process for the preparation of a glassy carbon-coated article comprising the steps of: dissolving a thermal decomposition product of an organic polymer in a solvent to produce a solution; adding a carbonized product of said organic polymer to said solution to form a slurry, said slurry containing 1 weight part of said thermal decomposition product and not higher than 5 weight parts of said carbonized product of said organic polymer; affixing said slurry to a graphite substrate having a difference in the thermal expansion coefficient from said glassy carbon of not higher than 1.5×10 -6 /°C., and heating said graphite substrate having said slurry affixed thereto at 600° C. to 1300° C. for not less than 30 minutes in an atmosphere selected from an inert atmosphere and a vacuum.
Claim 8
Dependent Claim
17 words
A process according to claim 5 wherein the concentration of said solution is 200 to 500 g/l.
Claim 9
Dependent Claim
46 words
A process according to claim 5 further comprising an additional step of drying said graphite substrate after said step of affixing said slurry, again affixing said slurry to the thus coated substrate and drying the thus processed substrate, said additional step being performed at least once.
Claim 10
Dependent Claim
16 words
A process according to claim 7 wherein said drying is performed at 50° to 100° C.
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) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |