Patents by Inventor Ronald L. MacFarlane

Ronald L. MacFarlane 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).

  • Air driven impact operated ground piercing tool
    Patent number: 4872516
    Abstract: An improved air-driven ground impact borer including an air valve assembly constructed of a flexible, high-lubricity plastic material such as phenolic-impregnated linen; and a reciprocal striker including, on its posterior end, a sealing bearing in the form of a split ring made of a long-wearing, resilient, high-lubricity material such as oil-filled nylon and, on its anterior end, two or more spot bearings of relatively small surface area and made of a long-wearing, resilient, high-lubricity material such as oil-filled nylon.
    Type: Grant
    Filed: April 29, 1988
    Date of Patent: October 10, 1989
    Assignee: Oklahoma Airrow, Inc.
    Inventors: Ronald L. MacFarlane, Dirk A. Wilson