Nippon Kokan Koji Kabushiki Kaisha

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6357506 Joining apparatus of thermoplastic pipesExpiredJan 07, 00Mar 19, 02[B29C]
6029727 Jointing apparatus of thermo plastic pipesExpiredApr 13, 98Feb 29, 00[B29C]
5940952 Method for applying corrosion-protective coating to joint between corrosion-protectively coated steel pipesExpiredOct 11, 96Aug 24, 99[B23P]
5926936 Method for applying corrosion-protective coating to joint between corrosion-protectively coated steel pipesExpiredOct 11, 96Jul 27, 99[B23P]
5451284 Self-mobile work vehicle moveable through pipeline and method and apparatus for lining interconnecting branch pipe using the vehicleExpiredDec 14, 93Sep 19, 95[B29C]
4686341 Gas shield chamber for arc welding of railsExpiredApr 07, 86Aug 11, 87[B23K]
4672173 Gas-shielded arc welding apparatusExpiredFeb 11, 86Jun 09, 87[B23K]
4550635 Pipe end cutting apparatusExpiredJun 14, 83Nov 05, 85[B23B]
4511784 Method for welding by magnetically driven arcExpiredApr 15, 83Apr 16, 85[B23K]

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