INSITUFORM OF NORTH AMERICA, INC., A CORP. OF DE

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5172730 Two-wall leakage detection system for a pipeExpiredFeb 07, 92Dec 22, 92[F16L]
5153718 Cutting apparatus with viewerExpiredNov 16, 90Oct 06, 92[H06N]
5018545 Apparatus for cleaning interior of a lateral pipelineExpiredJan 19, 90May 28, 91[B08B]
4901424 Method of forming an end seal for a pipe linerExpiredJul 26, 88Feb 20, 90[B23P, B29C]
4655638 Waterstop for monolith joints and methodExpiredJun 12, 86Apr 07, 87[E02B]
4626133 Waterstop for monolith jointsExpiredSep 13, 84Dec 02, 86[E02B]
4197908 Apparatus for porting a side wall of a conduit from interiorly thereofExpiredApr 06, 78Apr 15, 80[E03F]
4182262 Apparatus for impregnating a tubeExpiredJul 05, 78Jan 08, 80[B05C]

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