Patents by Inventor Robert James PLETSCHER

Robert James PLETSCHER 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).

  • Compact linear actuator
    Patent number: 9291161
    Abstract: A fluid-driven linear actuator comprises a piston configured for reciprocating motion in a piston chamber and a spool valve in a valve chamber. The valve chamber is fluidly connected to a fluid input and to a fluid output. The spool valve is configured to be hydraulically moved within the valve chamber between a plurality of spool valve configurations, comprising a first spool valve configuration wherein the valve chamber is fluidly connected to the piston chamber to thereby create a first fluid pressure differential which tends to force the piston in a first axial direction and a second spool valve configuration wherein the valve chamber is fluidly connected to the piston chamber to thereby create a second fluid pressure differential which tends to force the piston in a second axial direction.
    Type: Grant
    Filed: October 2, 2012
    Date of Patent: March 22, 2016
    Inventors: James Victor Hogan, Robert James Pletscher
  • COMPACT LINEAR ACTUATOR
    Publication number: 20140090552
    Abstract: A fluid-driven linear actuator comprises a piston configured for reciprocating motion in a piston chamber and a spool valve in a valve chamber. The valve chamber is fluidly connected to a fluid input and to a fluid output. The spool valve is configured to be hydraulically moved within the valve chamber between a plurality of spool valve configurations, comprising a first spool valve configuration wherein the valve chamber is fluidly connected to the piston chamber to thereby create a first fluid pressure differential which tends to force the piston in a first axial direction and a second spool valve configuration wherein the valve chamber is fluidly connected to the piston chamber to thereby create a second fluid pressure differential which tends to force the piston in a second axial direction.
    Type: Application
    Filed: October 2, 2012
    Publication date: April 3, 2014
    Inventors: James Victor HOGAN, Robert James PLETSCHER