Patents by Inventor Max P. Gassman

Max P. Gassman 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).

  • Low-speed high-torque chipper-shredder machine
    Patent number: 7070132
    Abstract: A yard waste chipper-shredder machine includes a reversible electric motor to drive a roller at low speed and high torque. The waste material is fed into an inlet chute and is crushed and ground into mulch between the roller and the chute for discharge through an outlet chute. The chute is spring biased to reduce jams. The machine operates quietly. Jams are quickly and easily removed by reversing the motor.
    Type: Grant
    Filed: August 21, 2003
    Date of Patent: July 4, 2006
    Assignee: Iowa State University Research Foundation, Inc.
    Inventor: Max P. Gassman
  • Egg inoculation device and method of using same
    Patent number: 4928628
    Abstract: A device is shown for inoculating eggs where the egg is supported from movement, and inoculant fluid is forced at positive pressure into an inoculant chamber abutting one end of the egg, where the fluid is forced through the pores of the shell to the interior of the egg, without causing damage to the shell.
    Type: Grant
    Filed: June 13, 1988
    Date of Patent: May 29, 1990
    Assignee: Iowa State University Research Foundation, Inc.
    Inventors: Max P. Gassman, David J. Larson, Darrell W. Trampel
  • Stroke control valve
    Patent number: 4498846
    Abstract: A pump displacement control valve alternately connects charge pressure and pump output high pressure to the displacement control chamber of a variable displacement pump and includes a check valve which prevents high pressure fluid from entering the charging circuit.
    Type: Grant
    Filed: June 20, 1983
    Date of Patent: February 12, 1985
    Assignee: Deere & Company
    Inventor: Max P. Gassman