Patent US3915906A successfully refreshed from Google Patents.
US3915906A
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Processes for the production of gasket materials from coal
Assignee: Bergwerksverband GmbH
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Filing: 1973-04-02
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Granted: 1975-10-28
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Expires: 1993-04-02
Abstract
Abstract Gasket materials in the form of shaped forms such as discs, tubes, rings, or sheets are produced by mixing comminuted coal together with between 10 and 30% by weight of a comminuted elastomeric polymer, a thermoplastic polymer resin, and optionally, a fibrous material, and molding the mixture at a temperature between 100* and 250*C.
Inventors
- 👤 Ingo Romey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:03
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/10; C09K3/1025; C09K3/1028; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C09K2200/00; C09K2200/02; C09K2200/0204; C09K2200/0208; C09K2200/0278; C09K2200/0282; C09K2200/0286; C09K2200/0291; C09K2200/06; C09K2200/0607; C09K2200/0615; C09K2200/0617; C09K2200/062; C09K2200/0635; Y; Y10; Y10S; Y10S215/00; Y10S215/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
A PROCESS FOR THE PRODUCTION OF GASKET MATERIALS FROM COAL, COMPRISING MIXING COMMINUTED COAL PARTICLES WITH BETWEEN SUBSTANTIALLY 1 TO 10 PERCENT BY WEIGHT OF THERMOPLASTIC RESINOUS POLYMER AND ABOUT 10 TO 30 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF THE RESULTING MIXTURE OF AN ELASTOMER, THE ELASTOMER BEING IN PULVERIZED, EMULSIFIED OR DISSOLVED FORM, AND MOULDING THE MIXTURE AT TEMPERATURES BETWEEN ABOUT 100* AND 250*C SO AS TO OBTAIN A GASKET MATERIAL, TE ELASTOMER IN THEGASKET MATERIAL BEING CHEMICALLY UNVULCANIZED SO THAT THE GASKET MATERIAL REMAINS RELATIVELY SOFT AND FLEXIBLE FOR GASKET APPLICATIONS.
Claim 2
Dependent Claim
95 words
A PROCESS FOR THE PRODUCTION OF GASKET MATERIALS FROM COAL, COMPRISING MIXING COMMINUTED COAL PARTICLES WITH BETWEEN SUBSTANTIALLY 1 TO 10 PERCENT BY WEIGHT OF THERMOPLASTIC RESINOUS POLYMER AND ABOUT 10 TO 30 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF THE RESULTING MIXTURE OF AN ELASTOMER, THE ELASTOMER BEING IN PULVERIZED, EMULSIFIED OR DISSOLVED FORM, AND MOULDING THE MIXTURE AT TEMPERATURES BETWEEN ABOUT 100* AND 250*C SO AS TO OBTAIN A GASKET MATERIAL, TE ELASTOMER IN THEGASKET MATERIAL BEING CHEMICALLY UNVULCANIZED SO THAT THE GASKET MATERIAL REMAINS RELATIVELY SOFT AND FLEXIBLE FOR GASKET APPLICATIONS.
Claim 3
Dependent Claim
40 words
A process as defined in claim 1 in which between 5 and 40% by weight of an inert fibrous material, based upon the weight of the coal in the said mixture, is added to the mixture during the mixing step.
Claim 4
Dependent Claim
34 words
A process as defined in claim 1 in which between 2 and 7% by weight of a plasticizer, based upon the weight of the coal, is added to the mixture during the mixing step.
Claim 5
Dependent Claim
28 words
A process as defined in claim 1 in which the mixture contains between 4 and 5% by weight of a plasticizer, based upon the weight of the coal.
Claim 6
Dependent Claim
81 words
A process as defined in claim 1 in which the mixture is prepared by mixing approximately 70 parts by weight of comminuted coal having a content of approximately 18% by weight of volatile components and a particle size below 80 microns, approximately 20 parts of a pulverized copolymeric resin of butadiene and styrene, and approximately 7 parts by weight of a polyethylene resin, and in which the molding step is carried out by extrusion at a temperature between 130* and 150*C.
Claim 7
Dependent Claim
14 words
A gasket material produced in accordance with a process as defined in claim 1.
Claim 8
Dependent Claim
32 words
A process as defined in claim 1 in which the thermoplastic resinous polymer is added to the mixture in the form of particles having a size of less than substantially 200 microns.
Claim 9
Dependent Claim
24 words
A process as defined in claim 1 in which the thermoplastic resinous polymer is added to the mixture in pulverized, emulsified or dissolved form.
Claim 10
Dependent Claim
91 words
A process as defined in claim 1 in which the mixture is prepared by mixing approximately 72.5 percent by weight of pulverized bituminous coal, based on the weight of the mixture, approximately 17.5 percent by weight of neoprene synthetic rubber, based on the weight of the mixture and approximately 10 percent by weight of polyvinyl chloride, based on the weight of the mixture, the bituminous coal having a content of approximately 25 percent of volatile components, and the molding step comprising compression of the mixture to the form of a disc.
Claim 11
Dependent Claim
21 words
A process as defined in claim 1 in which the coal particles have a size of less than substantially 200 microns.
Claim 12
Dependent Claim
30 words
A process as defined in claim 1 in which the elastomer is in pulverized form and the particles of the elastomer have a size of less than substantially 200 microns.
Claim 13
Dependent Claim
21 words
A process as defined in claim 1 in which the pressure is relieved during the molding step to release liberated gases.
Claim 14
Dependent Claim
34 words
A process as defined in claim 1 in which the elastomer is in emulsified or dissolved form and the emulsifying agent or solvent is expelled by heating the mixture prior to the molding step.
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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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |