Patents by Inventor Erik Oscar Abefelt

Erik Oscar Abefelt 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).

  • Testing method and apparatus for verifying correct connection of curcuit elements
    Patent number: 5937032
    Abstract: A method and apparatus for testing for correct connection together of circuit elements in a circuit formed of a plurality of redundant circuit portions. A coded signal is generated at a first circuit element and transmitted upon a signal path believed to connect the first circuit element with a second circuit element. If the coded signal is detected at the second circuit element, the correct connection of the first circuit element together with the second circuit element is verified. Because a coded signal is generated, the correct connection between the circuit elements can be verified even when the signal path connecting the first and second circuit elements is formed of an optical, or other non-electrical, coupler.
    Type: Grant
    Filed: November 29, 1995
    Date of Patent: August 10, 1999
    Assignee: Telefonaktiebolaget L M
    Inventors: Arto Juhani Nummelin, Peter Carl Birger Lundh, Erik Oscar Abefelt, Karl Anders Bjenne