Patents by Inventor Gunnar Nelson

Gunnar Nelson 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).

  • Connector
    Patent number: 5197908
    Abstract: A connector pair has a receptacle and a plug. The receptacle has a sleeve with an outer mouth. The sleeve converges towards its outer mouth. The plug has a prong with a graded tip. This prong diverges towards the tip. The prong is sized to fit snugly inside the sleeve. Thus, the outside of the prong can make intimate electrical contact with the inside of said sleeve.
    Type: Grant
    Filed: November 29, 1991
    Date of Patent: March 30, 1993
    Inventor: Gunnar Nelson
  • Waterproof electrical switch
    Patent number: 4335286
    Abstract: A waterproof electrical switch or circuit breaker is precluded from being set in the ON position, except after a plug has been inserted into the receptacle and a safety-interlocking mechanism has been activated. Withdrawal of the plug from the receptacle is precluded, except when the circuit breaker is in the OFF position.
    Type: Grant
    Filed: February 25, 1980
    Date of Patent: June 15, 1982
    Inventor: Gunnar Nelson