Patents by Inventor Donald E. Essmeier

Donald E. Essmeier 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).

  • Hydraulic mining nozzle-air lift device
    Patent number: 3938600
    Abstract: A hydraulic nozzle device for removing soil from the interior and below a hollow structure.
    Type: Grant
    Filed: February 26, 1975
    Date of Patent: February 17, 1976
    Assignee: Continental Oil Company
    Inventor: Donald E. Essmeier