Patents by Inventor Sven Gunnar Wretemark

Sven Gunnar Wretemark 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).

  • Patent number: 4109098
    Abstract: A cable for carrying high voltage has encompassed on its metallic conductor core with an inner layer of semiconducting material. An insulation layer encompasses this semiconducting layer and is in turn encompassed by an outer semiconducting layer. This outer semiconducting layer is strongly bonded to the underlying insulation layer and its outer surface resistivity is selected to be within the range of 10.sup.7 - 10.sup.9 ohm/square. Such resistivity range equalizes the voltage distribution within the cable jacket and also facilitates splicing cable ends and terminating the cable as the outer semiconducting layer need not and in fact cannot be readily removed.
    Type: Grant
    Filed: September 1, 1976
    Date of Patent: August 22, 1978
    Assignee: Telefonaktiebolaget L M Ericsson
    Inventors: Mats Gunnar Olsson, Carl Ove Tollerz, Sven Gunnar Wretemark