Patents by Inventor John R. Freeman

John R. Freeman 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).

  • Valve assembly for an oscillating pump
    Patent number: 4824337
    Abstract: A valve assembly (16) for an oscillating pump (10) of the type having a reciprocating armature (12) which carries an impeller (13) includes a rigid valve seat (17) carried by and movable with the impeller (13). The assembly (16) also includes an elastomeric valve (18) which is carried by the valve seat (17) within the impeller (13) and which divides the pump chamber therein into an inlet side (14) and outlet side (15). Reciprocation of the armature (12) first causes the valve (18) to engage the valve seat (17) to discharge fluid from the outlet side (15) of the pump chamber and then causes the valve (18) to disengage the valve seat (17) to permit fluid to pass from the inlet side (14) to the outlet side (15) of the pump chamber.
    Type: Grant
    Filed: December 24, 1987
    Date of Patent: April 25, 1989
    Assignee: The Gorman-Rupp Company
    Inventors: Darrell M. Lindner, John R. Freeman