Patents by Inventor James Thomas Schaefer, Jr.

James Thomas Schaefer, Jr. 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).

  • System and method for controlling working fluid charge in a vapor compression air conditioning system
    Patent number: 7866172
    Abstract: Vapor compression air conditioning systems are provided with a flow restrictor for transferring working fluid to and from at least one of the compressor low pressure inlet conduit and compressor high pressure outlet conduit to provide for accurate charge adjustment to achieve predetermined fluid sub-cooling. Pressure and temperature measurements are taken at a condenser fluid outlet conduit and provided to a microcontroller for determining fluid sub-cooling and comparing sub-cooling with a predetermined target sub-cooling. A charge addition or recovery apparatus may include a solenoid valve controlled by the microcontroller to more accurately control the addition or recovery of refrigerant fluid charge.
    Type: Grant
    Filed: July 14, 2006
    Date of Patent: January 11, 2011
    Assignee: Trane International Inc.
    Inventors: Jonathan David Douglas, James Thomas Schaefer, Jr., Gregory F. Walters
  • System and Method For Controlling Working Fluid Charge In A Vapor Compression Air Conditioning System
    Publication number: 20100101246
    Abstract: Vapor compression air conditioning systems are provided with a flow restrictor for transferring working fluid to and from at least one of the compressor low pressure inlet conduit and compressor high pressure outlet conduit to provide for accurate charge adjustment to achieve predetermined fluid sub-cooling. Pressure and temperature measurements are taken at a condenser fluid outlet conduit and provided to a microcontroller for determining fluid sub-cooling and comparing sub-cooling with a predetermined target sub-cooling. A charge addition or recovery apparatus may include a solenoid valve controlled by the microcontroller to more accurately control the addition or recovery of refrigerant fluid charge.
    Type: Application
    Filed: December 30, 2009
    Publication date: April 29, 2010
    Applicant: TRANE INTERNATIONAL INC.
    Inventors: Jonathan David DOUGLAS, James Thomas SCHAEFER, JR., Gregory F. WALTERS