Patents by Inventor Robert William Harper

Robert William Harper 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).

  • Belleville washer and Belleville spring
    Patent number: 10663026
    Abstract: A Belleville washer with interlocking teeth to allow one washer to firmly lock to an adjacent washer, positioned in series, allowing for assembly of a modular-type stackable spring, without need of a bolt for retention of washer alignment.
    Type: Grant
    Filed: October 3, 2018
    Date of Patent: May 26, 2020
    Assignee: Check-Mate Industries, Inc.
    Inventor: Robert William Harper
  • BELLEVILLE WASHER AND BELLEVILLE SPRING
    Publication number: 20200109756
    Abstract: A Belleville washer with interlocking teeth to allow one washer to firmly lock to an adjacent washer, positioned in series, allowing for assembly of a modular-type stackable spring, without need of a bolt for retention of washer alignment.
    Type: Application
    Filed: October 3, 2018
    Publication date: April 9, 2020
    Inventor: Robert William Harper