Patents by Inventor Dietmar Appel

Dietmar Appel 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).

  • Tubelet pocket
    Patent number: 4140839
    Abstract: A tubelet pocket construction for holding the positive electrodes of accumulators and a method for making same comprises two pieces of a textile sheet material which are connected together by parallel longitudinal seams which define a plurality of parallel tubelets. The textile sheet material comprises an electrolyte-resistant nonwoven fabric which is reinforced by a woven or laid fabric of electrolyte-resistant fibers.
    Type: Grant
    Filed: May 10, 1978
    Date of Patent: February 20, 1979
    Assignees: Carl Freudenberg, Gottfried Hagen AG
    Inventors: Harald Hoffman, Dietmar Appel