MEMCOR, INC., A CORP. OF DE

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4902424 Ultrafiltration thin film membranesExpiredAug 09, 88Feb 20, 90[B01D]
4900443 Porous aramid membranes and emulsions useful for the casting thereofExpiredMay 06, 87Feb 13, 90[B01D]
4855162 Polytetrafluoroethylene coating of polymer surfacesExpiredJul 17, 87Aug 08, 89[B05D]
4814082 Ultrafiltration thin film membranesExpiredOct 20, 86Mar 21, 89[B01D]
4801383 Selective twist filtration rovingExpiredNov 19, 84Jan 31, 89[B01D]
4774039 Dispersing casting of integral skinned highly asymmetric polymer membranesExpiredNov 19, 86Sep 27, 88[B29D]
4752396 Multi-strand wound filter with variant cross sectional densityExpiredOct 07, 85Jun 21, 88[B01D]
4664801 Filter cartridge sealing composition and process thereforExpiredApr 25, 85May 12, 87[B01D]
4614109 Method and device for testing the permeability of membrane filtersExpiredJul 15, 85Sep 30, 86[G01N]
4515606 Gas separating and venting filterExpiredMar 19, 81May 07, 85[B01D]
4488966 Filter pleat support meansExpiredSep 30, 82Dec 18, 84[B01D]
4432875 Semi-permeable membranes and processes for making the sameExpiredMay 29, 81Feb 21, 84[B01D]
4290889 Support for backflushable filter mediaExpiredJan 24, 80Sep 22, 81[B01D]
4225442 Core spun filtration rovingExpiredAug 22, 78Sep 30, 80[D02G, B01D]
D256944 Water filterExpiredApr 24, 78Sep 16, 80[D230]

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