Patents by Inventor James A. Kowalksi

James A. Kowalksi 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).

  • Vacuum level control system using variable frequency drive
    Patent number: 5960736
    Abstract: A vacuum control for milking systems includes a vacuum pump driven by an electric motor which is activated by a variable frequency drive (VFD). The VFD is controlled during a milking phase by plc programmable controller and a proportional/integral (PI) controller which respond to a vacuum feedback sensor connected to the milking system. The plc controller differentiates between milk and wash phases and also provides a fixed preset speed control for a washing phase for the milking system. The integrator interfaces between a milk/wash controller and the plc.
    Type: Grant
    Filed: April 17, 1997
    Date of Patent: October 5, 1999
    Assignee: Cornell Research Foundation, Inc.
    Inventors: David C. Ludington, Fangjiang Guo, James A. Kowalksi, Roger A. Pellerin
  • Vacuum level control system using variable frequency drive
    Patent number: 5878691
    Abstract: A vacuum control for milking systems includes a vacuum pump driven by an electric motor which is activated by a variable frequency drive (VFD). The VFD is controlled during a milking phase by plc programmable controller and a proportional/integral (PI) controller which respond to a vacuum feedback sensor connected to the milking system. The plc controller differentiates between milk and wash phases and also provides a fixed preset speed control for a washing phase for the milking system. The integrator interfaces between a milk/wash controller and the plc.
    Type: Grant
    Filed: April 17, 1997
    Date of Patent: March 9, 1999
    Assignee: Cornell Research Foundation, Inc.
    Inventors: David C. Ludington, Fangjiang Guo, James A. Kowalksi, Roger A. Pellerin