Patents by Inventor Charles E. Ballard

Charles E. Ballard 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).

  • Static oil seal assembly
    Patent number: 4120622
    Abstract: A static oil seal asembly to be carried within a seal receiving groove in a piston or the like and including a pair of separate, metallic, band-like scraper rails, each having one side adapted to engage a housing and the other side disposed within the groove, and a spacer of impervious, flexible material disposed between the scraper rails and abutting the sides of the scraper rails within the grooves in sealing relation therewith, the spacer including a built-in biasing spring for biasing the spacer rails outwardly of the groove.
    Type: Grant
    Filed: May 16, 1977
    Date of Patent: October 17, 1978
    Assignee: Caterpillar Tractor Co.
    Inventors: Alexander Goloff, Charles E. Ballard