Patents by Inventor Franz E. Weinhandl

Franz E. Weinhandl 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).

  • Two stage stepped piston air compressor
    Patent number: 4657488
    Abstract: An air compressor with a cylinder (1) has a stepped piston (4) movably disposed therein which performs compression in both stroke directions to provide two-stage compression. Each compression stage is associated with at least one inlet and outlet valve (34, 36 or 35, 37), whereby one outlet opening (22) of a lower compression stage is connected with an inlet opening (20) of a higher compression stage. All valves (34-37) are disposed on the upper side of the compressor in the vicinity of the cylinder head (13; 30). The compressor has few individual parts and the valves are easily accessible for maintenance.
    Type: Grant
    Filed: December 16, 1981
    Date of Patent: April 14, 1987
    Assignee: Rockwell International Corporation
    Inventor: Franz E. Weinhandl