Patents by Inventor Colin D. Johnstone

Colin D. Johnstone 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).

  • Conditioned vestibule for a cold storage doorway
    Patent number: 6960129
    Abstract: A conditioned vestibule for a cold storage doorway is disclosed. The vestibule includes a frame that supports inner and outer moveable door-forming members. The vestibule also includes a heater that circulates air between the inner and outer door-forming members and a variable-speed fan that varies flow of the air between the inner and outer door-forming members. In one embodiment, the airflow from the fan increases upon the opening of the door-forming members and decreases upon the closing of the door-forming members.
    Type: Grant
    Filed: January 9, 2004
    Date of Patent: November 1, 2005
    Assignee: HCR Incorporated
    Inventors: Paul Ashley, Colin D. Johnstone, Peter R. Smith
  • Conditioned vestibule for a cold storage doorway
    Publication number: 20040192187
    Abstract: A conditioned vestibule for a cold storage doorway is disclosed. The vestibule includes a frame that supports inner and outer moveable door-forming members. The vestibule also includes a heater that circulates air between the inner and outer door-forming members and a variable-speed fan that varies flow of the air between the inner and outer door-forming members. In one embodiment, the airflow from the fan increases upon the opening of the door-forming members and decreases upon the closing of the door-forming members.
    Type: Application
    Filed: January 9, 2004
    Publication date: September 30, 2004
    Inventors: Paul Ashley, Colin D. Johnstone, Peter R. Smith