Patents by Inventor Gianfranco Casagrande

Gianfranco Casagrande has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of producing acrylonitrile-base in-line dyed fibers using rapidly alternating dye solution cross flow
    Patent number: 4591361
    Abstract: The invention is concerned with a method of producing in-line dyed fibers, in a gel state, characterized in that it essentially consists of extruding the spinning dope in a coagulum bath, stretching the resulting filaments, scrubbing said filaments to remove residual solvent, passing the resulting filament tow through a dyeing bath at an overall rate in excess of 4 cm.sup.3 bath per second per square centimeter of tow surface area. The overall rate, being preferably in the 4 to 10 cm.sup.3 /sec per cm.sup.2 range, is achieved by means of crossflows to the forward advance direction of said tow, and alternately directed to and from said tow, the tow residence time in the dyeing bath being no longer than 5 seconds. The tow is then subjected to a dye fixing heat treatment, and is then scrubbed, finished, and dried. The method is particularly suitable for use with substantially acrylic and modacrylic fibers.
    Type: Grant
    Filed: December 27, 1983
    Date of Patent: May 27, 1986
    Assignee: Snia Fibre S.p.A.
    Inventors: Giorgio Cazzaro, Antonino Cavallaro, Gianfranco Casagrande, Gianmarco Del Felice