US4234638A
Expired / Lapsed
US
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Composite graphite sheets
Assignee: Nippon Carbon Co Ltd
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Filing: 1977-07-20
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Granted: 1980-11-18
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Expires: 1997-07-20
Abstract
Abstract Composite sheets comprising expanded graphite, a sheet-like metallic core inserted therein and, if desired, a binder for the expanded graphite. In one embodiment, gaskets are prepared from the composite sheets.
Inventors
- 👤 Hiroshi Yamazoe
- 👤 Isao Sugiura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:03
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B14/00; C04B14/02; C04B14/022; C04B28/00; C04B28/34; C04B35/00; C04B35/515; C04B35/52; C04B35/536; C04B35/71; C04B35/74; E; E04; E04C; E04C5/00; E04C5/01; E04C5/06; F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/12; F16J15/121; F16J15/122; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24281; Y10T428/24289; Y10T428/24298; Y10T428/24322; Y10T428/24331; Y10T428/24339; Y10T428/24347; Y10T428/24628; Y10T428/30
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
146 words
A composite sheet for gaskets, prepared by the steps of mixing expanded graphite having a c direction expansion of 10-300 times the c direction dimension of the original graphite particles with an inorganic binder selected from the group consisting of Al 2 O 3 .3P 2 O 5 .6H 2 O, and Al 2 O 3 .0.25Cr 2 O 3 .3P 2 O 5 .nH 2 O, each in an amount of 0.1 to 30 wt.%, inserting a hooked metallic sheet into said mixture as a core, said metallic sheet having a plurality of protrusions extending from the general plane of the metallic sheet, and compression molding the mixture at a pressure of 50-200 kg/cm 2 and a temperature of at least 500° C. to form a composite gasket sheet in which the metallic sheet is embedded within the gasket sheet and secured by said protrusions.
Claim 2
Dependent Claim
146 words
A composite sheet for gaskets, prepared by the steps of mixing expanded graphite having a c direction expansion of 10-300 times the c direction dimension of the original graphite particles with an inorganic binder selected from the group consisting of Al 2 O 3 .3P 2 O 5 .6H 2 O, and Al 2 O 3 .0.25Cr 2 O 3 .3P 2 O 5 .nH 2 O, each in an amount of 0.1 to 30 wt.%, inserting a hooked metallic sheet into said mixture as a core, said metallic sheet having a plurality of protrusions extending from the general plane of the metallic sheet, and compression molding the mixture at a pressure of 50-200 kg/cm 2 and a temperature of at least 500° C. to form a composite gasket sheet in which the metallic sheet is embedded within the gasket sheet and secured by said protrusions.
Claim 3
Dependent Claim
38 words
A composite sheet for gaskets according to claim 1 wherein the ratio between the total area of the perforations of the hooked metallic sheet and the area of the original sheet surface is in the range of 1-50%.
Claim 4
Dependent Claim
46 words
A composite sheet for gaskets according to claim 1 wherein said metallic sheet has perforations formed by said cut portions having been bent away from the general plane of the metallic sheet, said molded mixture of expanded graphite and inorganic binder being disposed in said perforations.
Claim 5
Dependent Claim
16 words
A composite sheet for gaskets according to claim 3 wherein said protrusions have hooked terminating ends.
Claim 6
Dependent Claim
20 words
A composite sheet for gaskets according to claim 3 wherein said protrusions extend from both sides of said metallic sheet.
Claim 7
Dependent Claim
17 words
A composite sheet for gaskets according to claim 3 wherein said protrusions have a generally rectangular configuration.
Claim 8
Dependent Claim
17 words
A composite sheet for gaskets according to claim 3 wherein said protrusions have a generally triangular configuration.
Claim 9
Dependent Claim
112 words
A composite sheet for gaskets, prepared by the steps of mixing expanded graphite having a c direction expansion of 10-300 times the c direction dimension of the original graphite particles with oxidized graphite as a binder in an amount of 3-40 wt.%, inserting a hooked metallic sheet into said mixture as a core, said metallic sheet having a plurality of protrusions extending from the general plane of the metallic sheet, and compression molding the mixture at a pressure of 50-200 kg/cm 2 and a temperature of at least 500° C. to form a composite gasket sheet in which the metallic sheet is embedded within the gasket sheet and secured by said protrusions.
Claim 10
Dependent Claim
112 words
A composite sheet for gaskets, prepared by the steps of mixing expanded graphite having a c direction expansion of 10-300 times the c direction dimension of the original graphite particles with oxidized graphite as a binder in an amount of 3-40 wt.%, inserting a hooked metallic sheet into said mixture as a core, said metallic sheet having a plurality of protrusions extending from the general plane of the metallic sheet, and compression molding the mixture at a pressure of 50-200 kg/cm 2 and a temperature of at least 500° C. to form a composite gasket sheet in which the metallic sheet is embedded within the gasket sheet and secured by said protrusions.
Claim 11
Dependent Claim
38 words
A composite sheet for gaskets according to claim 8, wherein the ratio between the total area of the perforations of the hooked metallic sheet and the area of the original sheet surface is in the range of 1-50%.
Claim 12
Dependent Claim
46 words
A composite sheet for gaskets according to claim 8 wherein said metallic sheet has perforations formed by said cut portions having been bent away from the general plane of the metallic sheet, said molded mixture of expanded graphite and inorganic binder being disposed in said perforations.
Claim 13
Dependent Claim
16 words
A composite sheet for gaskets according to claim 10 wherein said protrusions have hooked terminating ends.
Claim 14
Dependent Claim
20 words
A composite sheet for gaskets according to claim 10 wherein said protrusions extend from both sides of said metallic sheet.
Claim 15
Dependent Claim
17 words
A composite sheet fo gaskets according to claim 10 wherein said protrusions have a generally rectangular configuration.
Claim 16
Dependent Claim
17 words
A composite sheet for gaskets according to claim 10 wherein said protrusions have a generally triangular configuration.
Claim 17
Independent Claim
116 words
A method of making a composite gasket sheet comprising the steps of mixing expanded graphite having a c direction expansion of 10-300 times the c direction dimension of the original graphite particles with oxidized graphite as a binder in an amount of 3 to 40 wt.%, inserting a hooked metallic sheet into said mixture as a core, said metallic sheet having a plurality of protrusions extending from the general plane of the metallic sheet, and compression molding the mixture at a pressure of 500-200 kg/cm 2 and a temperature of at least 500° C. to form a composite gasket sheet in which the metallic sheet is embedded within the gasket sheet and secured by said protrusions.
Claim 18
Independent Claim
116 words
A method of making a composite gasket sheet comprising the steps of mixing expanded graphite having a c direction expansion of 10-300 times the c direction dimension of the original graphite particles with oxidized graphite as a binder in an amount of 3 to 40 wt.%, inserting a hooked metallic sheet into said mixture as a core, said metallic sheet having a plurality of protrusions extending from the general plane of the metallic sheet, and compression molding the mixture at a pressure of 500-200 kg/cm 2 and a temperature of at least 500° C. to form a composite gasket sheet in which the metallic sheet is embedded within the gasket sheet and secured by said protrusions.
Claim 19
Independent Claim
147 words
A method of making a composite gasket sheet comprising the steps of mixing expanded graphite having a c direction expansion of 10-300 times the c direction dimension of the original graphite particles with an inorganic binder selected from the group consisting of Al 2 O 3 .3P 2 O 5 .6H 2 O and Al 2 O 3 .0.25Cr 2 O 3 .3P 2 O 5 .nH 2 O, each in an amount of 0.1 to 30 wt.%, inserting a hooked metallic sheet into said mixture as a core, said metallic sheet having a plurality of protrusions extending from the general plane of the metallic sheet, and compression molding the mixture at pressure of 50-200 kg/cm 2 and a temperture of at least 500° C. to form a composite gasket sheet in which the metallic sheet is embedded within the gasket sheet and secured by said protrusions.
Claim 20
Independent Claim
147 words
A method of making a composite gasket sheet comprising the steps of mixing expanded graphite having a c direction expansion of 10-300 times the c direction dimension of the original graphite particles with an inorganic binder selected from the group consisting of Al 2 O 3 .3P 2 O 5 .6H 2 O and Al 2 O 3 .0.25Cr 2 O 3 .3P 2 O 5 .nH 2 O, each in an amount of 0.1 to 30 wt.%, inserting a hooked metallic sheet into said mixture as a core, said metallic sheet having a plurality of protrusions extending from the general plane of the metallic sheet, and compression molding the mixture at pressure of 50-200 kg/cm 2 and a temperture of at least 500° C. to form a composite gasket sheet in which the metallic sheet is embedded within the gasket sheet and secured by said protrusions.
Claim 21
Dependent Claim
79 words
A method according to claim 16 wherein said metallic sheet is formed by bending cut portions of the metallic sheet away from the general plane of the metallic sheet such that the bent cut portions protrude and extend from the general plane of the metallic sheet, said compression molding step comprising compression molding the mixture into the perforations in the metallic sheet formed after said cut portions have been bent away from the general plane of the metallic sheet.
References Cited (Backward Citations)
US2029302A
Cited
US2006381A
Cited
US2930106A
Cited
US3061656A
Cited
US3404061A
Cited
US3423496A
Cited
US4042747A
Cited
US4075114A
Cited
US4146401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |