Patents by Inventor Zenon Piet

Zenon Piet 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).

  • Refrigerating systems with multiple evaporator fan and step control therefor
    Patent number: 4137057
    Abstract: A refrigeration system for cooling air having an evaporator; a compressor; a control for establishing ON periods and OFF periods of the compressor; at least two motor-driven fans positioned to force air over the evaporator; and a control system for the evaporator fans to cause fewer of the fans to run during compressor OFF periods and more of the fans to run during compressor ON periods.
    Type: Grant
    Filed: February 4, 1977
    Date of Patent: January 30, 1979
    Assignee: Kramer Trenton Co.
    Inventors: Zenon Piet, Daniel Kramer