Patents by Inventor Tadao Otoh

Tadao Otoh 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).

  • Defrosting controller for refrigeration systems
    Patent number: 5046324
    Abstract: A defrosting controller for use with a refrigeration system determines calculating a frost melting period from the measurements of the evaporator temperature during defrosting by means of an evaporator temperature sensor, establishes a refrigerating operation rate which is the ratio of the period of the frost melting process to the (total) open period of an electronic motor-driven valve during the refrigeration, and then decides whether the next defrosting operation is to be skipped or not.
    Type: Grant
    Filed: June 20, 1990
    Date of Patent: September 10, 1991
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Tadao Otoh, Yoshihisa Ishida, Satoshi Ohya, Masaki Ishiguro