Patents by Inventor Jerold R. Jeffries

Jerold R. Jeffries 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).

  • Agriculture chemical spray valve
    Patent number: 4156439
    Abstract: A low operating force valve which handles solutions having highly abrasive wettable powders. The valve is a low pressure butterfly-type, 3-way, two-position, valve; including a recirculating path in the closed position which is opened by a convex-shaped disc carried on a stem which rotates on the main valve shaft in conjunction with the two butterfly halves.
    Type: Grant
    Filed: October 11, 1977
    Date of Patent: May 29, 1979
    Assignee: The Cessna Aircraft Company
    Inventors: Jerold R. Jeffries, H. Glen Fickel, Donald E. Schifferdecker