Patents by Inventor Thomas W. Bradshaw

Thomas W. Bradshaw 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).

  • Refrigeration system and method for automated charging and start-up control
    Patent number: 11022356
    Abstract: A system for starting a refrigeration system includes a liquid line regulating valve, a liquid line charging valve, a suction line expansion valve, a suction line charging valve, and a controller. The controller is configured to override normal operation of the refrigeration system and transmit a demand signal to enable partial system operation. The controller is configured to operate the liquid line regulating valve and the liquid line charging valve to charge a receiver tank, gradually increase the demand signal to a predetermined level of partial system operation, and release the liquid line charging valve to normal operation. The controller is configured to operate the suction line expansion valve and the suction line charging valve to charge a suction line, gradually increase the demand signal to full system operation, and release the liquid line regulating valve, the suction line expansion valve, and the suction line charging valve to normal operation.
    Type: Grant
    Filed: March 7, 2019
    Date of Patent: June 1, 2021
    Assignee: Hill Phoenix, Inc.
    Inventors: Matthew W. Walden, Thomas W. Bradshaw, Peter J. Ferretti, Niel M. Hayes, Senthilkumar Kandappa Goundar Shanmugam
  • REFRIGERATION SYSTEM AND METHOD FOR AUTOMATED CHARGING AND START-UP CONTROL
    Publication number: 20190212043
    Abstract: A system for starting a refrigeration system includes a liquid line regulating valve, a liquid line charging valve, a suction line expansion valve, a suction line charging valve, and a controller. The controller is configured to override normal operation of the refrigeration system and transmit a demand signal to enable partial system operation. The controller is configured to operate the liquid line regulating valve and the liquid line charging valve to charge a receiver tank, gradually increase the demand signal to a predetermined level of partial system operation, and release the liquid line charging valve to normal operation. The controller is configured to operate the suction line expansion valve and the suction line charging valve to charge a suction line, gradually increase the demand signal to full system operation, and release the liquid line regulating valve, the suction line expansion valve, and the suction line charging valve to normal operation.
    Type: Application
    Filed: March 7, 2019
    Publication date: July 11, 2019
    Applicant: Hill Phoenix, Inc.
    Inventors: Matthew W. Walden, Thomas W. Bradshaw, Peter J. Ferretti, Niel M. Hayes, Senthilkumar Kandappa Goundar Shanmugam
  • Refrigeration system and method for automated charging and start-up control
    Patent number: 10260787
    Abstract: A system for starting a refrigeration system includes a liquid line regulating valve, a liquid line charging valve, a suction line expansion valve, a suction line charging valve, and a controller. The controller is configured to override normal operation of the refrigeration system and transmit a demand signal to enable partial system operation. The controller is configured to operate the liquid line regulating valve and the liquid line charging valve to charge a receiver tank, gradually increase the demand signal to a predetermined level of partial system operation, and release the liquid line charging valve to normal operation. The controller is configured to operate the suction line expansion valve and the suction line charging valve to charge a suction line, gradually increase the demand signal to full system operation, and release the liquid line regulating valve, the suction line expansion valve, and the suction line charging valve to normal operation.
    Type: Grant
    Filed: May 5, 2017
    Date of Patent: April 16, 2019
    Assignee: Hill Phoenix, Inc.
    Inventors: Matthew W. Walden, Thomas W. Bradshaw, Peter J. Ferretti, Niel M. Hayes, Senthilkumar Kandappa Goundar Shanmugam
  • REFRIGERATION SYSTEM AND METHOD FOR AUTOMATED CHARGING AND START-UP CONTROL
    Publication number: 20170336113
    Abstract: A system for starting a refrigeration system includes a liquid line regulating valve, a liquid line charging valve, a suction line expansion valve, a suction line charging valve, and a controller. The controller is configured to override normal operation of the refrigeration system and transmit a demand signal to enable partial system operation. The controller is configured to operate the liquid line regulating valve and the liquid line charging valve to charge a receiver tank, gradually increase the demand signal to a predetermined level of partial system operation, and release the liquid line charging valve to normal operation. The controller is configured to operate the suction line expansion valve and the suction line charging valve to charge a suction line, gradually increase the demand signal to full system operation, and release the liquid line regulating valve, the suction line expansion valve, and the suction line charging valve to normal operation.
    Type: Application
    Filed: May 5, 2017
    Publication date: November 23, 2017
    Applicant: Hill Phoenix, Inc.
    Inventors: Matthew W. Walden, Thomas W. Bradshaw, Peter J. Ferretti, Niel M. Hayes, Senthilkumar Kandappa Goundar Shanmugam
  • Cryogenic cooling apparatus
    Patent number: 5317878
    Abstract: The invention provides a controlled connection, or heat switch, between a source of cryogenic cooling and an item which is to be cooled, using control valve means which is not itself subjected to the cryogenic temperatures involved.
    Type: Grant
    Filed: August 20, 1992
    Date of Patent: June 7, 1994
    Assignee: British Technology Group Ltd.
    Inventors: Thomas W. Bradshaw, Anna H. Orlowska