Patents by Inventor Brian L. Doyle

Brian L. Doyle 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).

  • Rotating field plot row marker
    Patent number: 4237984
    Abstract: A rotating row marker equipped with both transverse and longitudinal imprinting projections impresses a grid-type pattern into the soil for precise placement of seeds or seedlings in a subsequent planting operation. One of the transverse projections houses an eccentric weight for gravitationally returning the row marker to a predetermined position when the row marker is raised above the earth.
    Type: Grant
    Filed: May 30, 1979
    Date of Patent: December 9, 1980
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: David L. Cobb, Brian L. Doyle, James A. Webster, David H. Smith, Jr.