Patents by Inventor John O. Tjebben

John O. Tjebben 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).

  • Patent number: 3958156
    Abstract: A drawout switchgear having an in-line vacuum circuit breaker carried on a truck which is insertable into a compartment of the switchgear; the truck carrying the breaker is inserted into the compartment and the truck and breaker as a unit is elevated into the connected position; in connected position each vacuum interrupter is enclosed in its own stationary porcelain housing which also contains the primary disconnects that feed vertically directly to the main horizontal bus and up through long porcelain insulators to outgoing compartments at the rear of circuit breaker compartment.
    Type: Grant
    Filed: October 21, 1974
    Date of Patent: May 18, 1976
    Assignee: Allis-Chalmers Corporation
    Inventor: John O. Tjebben