Patents by Inventor Lars E. Hammerberg

Lars E. Hammerberg 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).

  • Voltage controlled transient protection unit
    Patent number: 4456940
    Abstract: An arrangement for protection of circuits in a telephone exchange against overvoltages like for example lightning transients or so called longitudinal disturbances appearing on the lines connected to the exchange. The arrangement having at least two non-linear electronic circuit elements (T2, T3) which selectively shunt the overvoltages to ground, the junction between the conduction states, conducting-non-conducting, for at least one of the circuit elements being controllable.
    Type: Grant
    Filed: August 10, 1982
    Date of Patent: June 26, 1984
    Assignee: Telefonaktiebolaget L M Ericsson
    Inventors: Lars E. Hammerberg, Royne G. Hjortendal, Walter Ghisler