Osaka Bosui Construction Co., Ltd.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5108228 Method of lining branch pipe portion of underground main pipe with rigid plastics tubeExpiredMay 24, 90Apr 28, 92[F16L]
5101545 Method of reforming existing gas pipe by repairing joint portions thereofExpiredJan 08, 91Apr 07, 92[B23P]
5071616 Method of inserting rigid plastic lining tube through pipeExpiredDec 18, 90Dec 10, 91[B29C]
4965036 Method of lining a pipe with a tube including passing heated fluid through the bores of the tubeExpiredApr 04, 89Oct 23, 90[B29C]
4950446 Method of lining pipesExpiredAug 19, 88Aug 21, 90[B29C]
4859119 Liquid chemical grouting apparatus and valve switching arrangement in conduit system for supplying liquid chemicals to the apparatusExpiredMar 02, 88Aug 22, 89[E02D]

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