The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 1977
Filed:
Apr. 16, 1976
Robert M Salemme, Schenectady, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
A casting process is set forth for the preparation of microporous membranes from polycarbonate resin material. The polycarbonate resin is dissolved in an organic casting solvent to produce a solution stable at room temperature. The solution is cast as a thin film on a smooth substrate and is permitted to desolvate for at least a few seconds. Film and substrate are immersed in a bath characterized by the capabilities for swelling the polycarbonate resin, and for dissolving the first solvent, while not dissolving the polycarbonate resin. After formation of the film is initiated, the film and substrate are removed from the quenching bath and the film is either water-washed or air dried to attain the full mechanical strength thereof.