Patents by Inventor Erhard Fritz

Erhard Fritz 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).

  • Piston rod-less pneumatic cylinder
    Patent number: 6321636
    Abstract: In a piston rod-less pneumatic cylinder, the longitudinal slot (1) is sealed from the inside on either side of the piston with a sealing tape (3) which exhibits fixing elements (9) that engage a fixing edge (10) provided on the cylinder with a positive fit to secure the sealing tape (3) given an unpressurized interior. This ensures a reliable sealing of the interior even in an unpressurized state, and prevents leaks from starting when a previously unpressurized interior is pressurized.
    Type: Grant
    Filed: June 30, 1999
    Date of Patent: November 27, 2001
    Assignee: Hygrama AG
    Inventors: Erhard Fritz, Peter Rohatschek
  • Piston rod-less pneumatic cylinder
    Patent number: 6283010
    Abstract: In a piston rod-less pneumatic cylinder, the sealing tape (5) sealing the lateral longitudinal slot (3) from the inside on either side of the piston (2) is held by an outer band (6) covering the longitudinal slot (3) from outside with the cylinder interior (9, 10) in an unpressurized state. To reduce the forces necessary to engage or disengage this fixing joint, fixing elements (16, 17) interact in a purely frictionally engaged manner on the sealing tape (5) and outer band (6).
    Type: Grant
    Filed: June 29, 1999
    Date of Patent: September 4, 2001
    Assignee: Hygrama AG
    Inventors: Erhard Fritz, Peter Rohatschek