Patents by Inventor Lennart A. U. Ulfhielm

Lennart A. U. Ulfhielm 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).

  • Vacuum cleaner hose having an electrical conductor
    Patent number: 4133972
    Abstract: A vacuum cleaner hose having an electrical conductor for a motor driven work tool. The hose includes an inner and outer tube having a spacing therebetween which has been so chosen as to permit the electrical conductor therein to move relatively freely therebetween. The desirable result of the construction is that the vacuum cleaner hose is easier to handle and bend and at the same time the electrical conductor is carried within the hose and is not subject to the exposure of bare conductor wires due to wear.
    Type: Grant
    Filed: January 19, 1977
    Date of Patent: January 9, 1979
    Assignee: Aktiebolaget Electrolux
    Inventors: John N. J. Andersson, Harry K. G. Karlen, Lennart A. U. Ulfhielm