Patents by Inventor Ronald A. Ritter

Ronald A. Ritter 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).

  • Tube pulling apparatus
    Patent number: 6216326
    Abstract: A tube pulling apparatus has a body having a hydraulic fluid feeder tube extending to the body to pass oil under pressure therethrough. An inner shaft in the body has a hollow portion slidably mounted over the feeder tube and receives oil in an open area in the inner shaft. An inner piston is connected to the inner shaft and positioned to move the inner shaft responsive to oil pressure from a pair of oil lines. An outer shaft is slidably mounted over the inner shaft and has an outer piston connected thereto and positioned to move the outer shaft responsive to oil pressure from the oil lines. A spool valve is formed between the inner and outer shafts for activating the outer piston upon a predetermined movement of the inner shaft inside the outer shaft and a tube gripping mechanism is connected to both the inner and outer shafts for gripping and pulling a tube therewith by sliding the inner shaft to activate the gripping jaws and sliding the outer shaft to pull the gripped tube.
    Type: Grant
    Filed: January 24, 2000
    Date of Patent: April 17, 2001
    Inventors: Ronald A. Ritter, Michael R. Wilkerson
  • Wreath
    Patent number: D356752
    Type: Grant
    Filed: January 18, 1994
    Date of Patent: March 28, 1995
    Inventor: Ronald A. Ritter
  • Cross
    Patent number: D374964
    Type: Grant
    Filed: August 5, 1994
    Date of Patent: October 22, 1996
    Inventor: Ronald A. Ritter
  • Fanciful cross
    Patent number: D386714
    Type: Grant
    Filed: March 12, 1996
    Date of Patent: November 25, 1997
    Inventor: Ronald A. Ritter