Patents by Inventor Ulf Ivan Gunnar Andersson

Ulf Ivan Gunnar Andersson 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 and arrangement for detecting faults in a memory device
    Patent number: 4075466
    Abstract: A method and an arrangement is provided for detecting a faulty memory element among a plurality of memory elements. Two element categories are introduced. If a memory element belongs to the first category normal writing and reading processes are carried out. If a memory element belongs to the second category the writing processes as well as the reading processes are combined with an inversion a (binary complementing) of the actual transferred binary information. The category of an element is shifted at times, for example, before each writing process.
    Type: Grant
    Filed: August 30, 1976
    Date of Patent: February 21, 1978
    Assignee: Telefonaktiebolaget L M Ericsson
    Inventors: Bjorn Erik Rutger Jonsson, Ulf Ivan Gunnar Andersson, Gustav Ruben Bergman