Patents by Inventor Panchanan Mitra

Panchanan Mitra 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 laminating adhesive to a plurality of spaced fiber strips
    Patent number: 4131502
    Abstract: Ribbons of unidirectional fiber-reinforced plastics material are prepared by laying the unidirectional fibers in parallel strips, alternating with strips of another material, onto a plastics material which is on a backing sheet, applying a second backing sheet to the upper surface, which sheet may also be coated with plastics material, applying heat and pressure, and removing one sheet of release material together with the said alternating strips of another material.The unidirectional ribbons left on the backing sheet are suitable for filament winding operations.
    Type: Grant
    Filed: October 26, 1977
    Date of Patent: December 26, 1978
    Assignee: Ciba-Geigy Corporation
    Inventor: Panchanan Mitra
  • Method of forming narrow ribbons of fibers in plastic material
    Patent number: 4073670
    Abstract: A method of preparing narrow ribbons of unidirectional, fiber-reinforced plastic material, particularly suitable for filament winding operations, involves using a series of spaced discrete parallel strips of fibers and a plastics film, heating under pressure, and removing surplus plastics material from between each strip by application and removal of a continuous sheet.
    Type: Grant
    Filed: November 16, 1976
    Date of Patent: February 14, 1978
    Assignee: Ciba-Geigy Corporation
    Inventor: Panchanan Mitra