Patents by Inventor Calvin E. Redfern

Calvin E. Redfern 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).

  • Offset pivot ground switch
    Patent number: 4006325
    Abstract: An interphase support shaft is offset with respect to the rotation point to permit the shaft weight to serve as a counterbalance to the switch blade by locating its weight at a distance from the pivot point.
    Type: Grant
    Filed: November 19, 1975
    Date of Patent: February 1, 1977
    Assignee: Allis-Chalmers Corporation
    Inventor: Calvin E. Redfern
  • Ice breaking device for disconnect switch contact assemblies
    Patent number: 4001530
    Abstract: The disconnect switch blade, prior to the engagement of the blade plug with the switch contact shoes, engages with a curved upper portion of an ice breaker lever to effect its pivotal movement and thereby move a plurality of associated ice breaker bars from between the switch contact shoes to remove accumulated ice from the contact shoes.
    Type: Grant
    Filed: December 11, 1975
    Date of Patent: January 4, 1977
    Assignee: Allis-Chalmers Corporation
    Inventor: Calvin E. Redfern