ALPHABET, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4798365 Throttling gasket insert for use with knife gate valveExpiredMay 20, 87Jan 17, 89[F16K]
4646407 Method of making corrosion resistant valveExpiredFeb 26, 85Mar 03, 87[F16K, B29C]
4587989 Turn disc slide valveExpiredFeb 20, 85May 13, 86[F16L]
4377274 Knife gate valveExpiredNov 10, 80Mar 22, 83[F16K]

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