Sigri Elektrographit GmbH

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4507860 Production line for graphite nipplesExpiredDec 02, 82Apr 02, 85[H01R]
4482314 Method for heating carbon blanksExpiredMay 24, 83Nov 13, 84[F27B]
4474233 Tube bundle heat exchangerExpiredApr 08, 82Oct 02, 84[F28F]
4431686 Method for coating a porous electrodeExpiredSep 01, 82Feb 14, 84[B05D, C25B]
4425820 Connecting rod of a composite material and method for manufacturing the sameExpiredFeb 03, 81Jan 17, 84[G05G]
4369683 Discharging device for an extrusion pressExpiredMar 26, 81Jan 25, 83[B28B, B30B]
4366191 Method of increasing the strength of carbon and graphite membersExpiredJan 19, 78Dec 28, 82[B05D]
4315575 Vacuum support for burst protection deviceExpiredMay 28, 80Feb 16, 82[B65D]
4296177 Flexible graphite sheet, material or layer containing metal molybdateExpiredDec 21, 79Oct 20, 81[B32B]
4289604 Method of producing an isotropic cokeExpiredMar 31, 77Sep 15, 81[C10B]
4288353 Carbon bearing contact pasteExpiredOct 08, 80Sep 08, 81[C09J, C08L]
4255363 Column sealExpiredDec 21, 79Mar 10, 81[B01F]
4252629 Electrode for electrochemical processes especially electrowinning and method for manufacturing sameExpiredApr 03, 79Feb 24, 81[C25B]
4219405 Method of continuously producing cokeExpiredSep 28, 78Aug 26, 80[C10G]
4216266 Flexible graphite sheet material treated with an alkali metal salt containing at least one of the elements chromium, molybdenum and tungstenExpiredSep 21, 78Aug 05, 80[C01B]
4211594 Joining together shaped bodies of polytetrafluoroethyleneExpiredJan 09, 78Jul 08, 80[B29D, B65H, B32B]
4197149 Method for joining together shaped bodies of polytetrafluoroethyleneExpiredJan 06, 78Apr 08, 80[B29D, B32B]

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