Patents by Inventor Karl Evert Sjostrand

Karl Evert Sjostrand 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).

  • Submersible pump locking system
    Patent number: 4111611
    Abstract: An automatic locking system is provided for securing a submersible pump to vertical guide wires. The pump is automatically locked to the wires upon lowering of the pump and released upon raising the pump. Stationary cams in the pumping station actuate the locking system. The system assures locking when the pump is lowered and eliminates the need for manual unlocking by the serviceman when raised.
    Type: Grant
    Filed: July 29, 1977
    Date of Patent: September 5, 1978
    Assignee: ITT Industries, Incorporated
    Inventors: Karl-Gunnar Andersson, Karl Evert Sjostrand