Patents by Inventor Frederick Eric Johnston

Frederick Eric Johnston 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).

  • Rock drilling apparatus and method
    Patent number: 4102413
    Abstract: A method of drilling a large hole through rock and removing the drilling waste by drilling a pilot hole from one rock face to another, reverse drilling with a large drill bit and removing the waste during the reverse drilling by pressurizing the pilot hole to eject the waste through a muck extractor dragged behind the large drill bit; and an apparatus to carry out this method consisting of a sealing member for the one rock face, and a muck extractor for securement to the large drill bit.
    Type: Grant
    Filed: September 7, 1976
    Date of Patent: July 25, 1978
    Inventor: Frederick Eric Johnston