PWT PARTNERS, L.P.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5102542 Construction of canister-type filtersExpiredJan 25, 90Apr 07, 92[C02F]
D324721 Water purifierExpiredSep 28, 89Mar 17, 92[]
5069782 Fluid purification systemsExpiredApr 26, 90Dec 03, 91[C02F, B01D]
5004541 Fluid purification systemExpiredSep 02, 88Apr 02, 91[B01D]
D314607 Water purifierExpiredNov 16, 89Feb 12, 91[]
4968437 Fluid purification systemExpiredApr 19, 88Nov 06, 90[G01N]
4769131 Ultraviolet radiation purification systemExpiredOct 03, 86Sep 06, 88[C02F]

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