Patents by Inventor Rolf I. B. Kjellsson

Rolf I. B. Kjellsson 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).

  • Printed circuit board for mounting in a backplane
    Patent number: 4947288
    Abstract: The present invention relates to a printed circuit board provided with electrical contact devices (7) and intended to be mounted in the back plane of a card frame (2) such as to form a magazine (1) in which printed circuit cards (6) having electrical contact devices (8) corresponding to the contact devices (7) on the board can be inserted at right angles to the back plane. The circuit board (3) forms an electrical connecting unit for the circuit cards in the back plane of the magazine. In accordance with the invention, the circuit board is configured to provide a self-supporting and stiffening structure in the form of a sandwich element (10).
    Type: Grant
    Filed: August 31, 1989
    Date of Patent: August 7, 1990
    Assignee: Telefeonaktiebolaget L M Ericsson
    Inventors: Torbjorn R. Olsson, Bjorn T. Kassman, Karl Gustaf Olsson, Stig C. Ernolf, Per-Ove Nilsson, Rolf I. B. Kjellsson, Lars H. Widoff