BARRETT, HAENTJENS & CO., A CORPORATION OF PA

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5,092,909 Biodesulphurization process utilizing bacteriaExpiredDec 11, 89Mar 03, 92[C10L]
5,045,202 Centrifugal oxygenator for treatment of waste water and systemExpiredApr 13, 87Sep 03, 91[C02C]
4,858,828 Multi-gun control valveExpiredSep 15, 86Aug 22, 89[B05B]
4,818,392 Liquid waste treatment systemExpiredNov 30, 87Apr 04, 89[C02F, B01D]
4,747,757 Submersible mixing pumpExpiredNov 26, 86May 31, 88[F04B, B01F]
4,700,808 Shaft mounted bearing lubricating deviceExpiredJul 17, 86Oct 20, 87[F16N]
4,655,684 Centrifugal pump for wide range of operating conditionsExpiredAug 02, 84Apr 07, 87[F04D]

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