Novel membranes and process for making them
Patent 4761233 Issued on August 2, 1988. Estimated Expiration Date: 
March 10, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 10, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesUltrafiltration membrane of polyamide Process for producing dense membranes Patent #: 4605526 InventorsAssigneeApplicationNo. 07/024327 filed on 03/10/1987US Classes:210/500.37, Amine210/500.38, Amide210/500.4, Carbonate210/500.41, Sulfone264/216, Rubber or synthetic resin containing liquid264/331.19, Nitrogen containing (e.g., polyamide, polyurethane, etc.)264/41PORE FORMING IN SITU (E.G., FOAMING, ETC.)ExaminersPrimary: Anderson, PhilipAttorney, Agent or FirmInternational ClassesB01D 67/00 (20060101)B01D 71/00 (20060101) B01D 69/00 (20060101) B01D 69/02 (20060101) B01D 71/52 (20060101) Foreign Application Priority Data1986-03-17 ILAbstractA process for preparing a microporous membrane, which comprises casting the membrane from a solution comprising a mixture of at least one pore-forming polymer and at least one film-forming polymer, and a solvent for the mixture of polymers, wherein the at least one pore-forming polymer is one which if cast alone would contract to form either large pores or a non-uniform distribution of material. | |
