New York Gas Group

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6237640 Variable length pipe repair fittingExpiredJul 12, 00May 29, 01[F16L]
5852795 Apparatus for controlling a multiplicity of compressorsExpiredNov 22, 96Dec 22, 98[H04Q]
5749356 Low NOX and CO emissions direct contact high temperature water heaterExpiredJun 13, 97May 12, 98[F24H]
5126654 Non-invasive, high resolution detection of electrical currents and electrochemical impedances at spaced localities along a pipelineExpiredApr 02, 90Jun 30, 92[G01N]
5087873 Non-invasive, high resolution detection of electrical currents and electrochemical impedances at spaced localities along a pipelineExpiredApr 24, 91Feb 11, 92[G01N, C23F]

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