Patents by Inventor Hermann Dallman

Hermann Dallman 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).

  • Multi-layer polyester film for magnetic tape
    Patent number: 4798759
    Abstract: A coextruded, biaxially draw-oriented, multi-layer polyester film as a base film for magnetic tape is described, whose characteristics are that the total thickness of the multi-layer film is no more than 10 .mu.m, the surface roughness of the base film on the side intended for the application of an information-carrying coating has an R.sub.a value (DIN 4768) of less than or equal to 0.010 .mu.m and the surface roughness of the opposite side of the base film which is not intended for application of an information-carrying coating, has an R.sub.a value of greater than 0.010 .mu.m and that the film has an E-modulus in the machine direction of greater than or equal to 6500 N/mm.sup.2.
    Type: Grant
    Filed: March 13, 1987
    Date of Patent: January 17, 1989
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hermann Dallman, Hartmut Hensel, Werner Schafer