Patents by Inventor Richard L. Rothrock

Richard L. Rothrock 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 drilling machine
    Patent number: 4246974
    Abstract: Apparatus for drilling a pier hole under the ledge of a building foundation to permit lifting the foundation for relevelling of the building, the apparatus having an adjustable drill support frame to drill downwardly. A transmission and drill bit depending from said drill support frame and a crowd bar adapted to move the drill bit under the foundation once the top of the drill bit is has passed the bottom of the foundation. By moving the drill bit under the foundation this permits a more vertical shaft providing better support for the foundation.
    Type: Grant
    Filed: June 19, 1978
    Date of Patent: January 27, 1981
    Assignee: BPR Grouting and Engineering, Inc.
    Inventor: Richard L. Rothrock