Patents by Inventor Hisato Katayama

Hisato Katayama 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).

  • Clean room having partially different degree of cleanliness
    Patent number: 4699640
    Abstract: A clean room is adapted to provide a plurality of clean air zones with different degrees of cleanliness. Air is passed through high efficiency particulate air filters in the ceiling of the room and withdrawn through shutters in the floor of the room. The shutters are adjustable to maintain a pressure-balanced system. The room is divided by walls and partitions to define different zones which are filtered by different classes of filters depending on the degree of cleanliness required in each zone.
    Type: Grant
    Filed: July 14, 1986
    Date of Patent: October 13, 1987
    Assignee: Kajima Corporation
    Inventors: Masami Suzuki, Kouki Yamaguchi, Hisato Katayama, Tadayoshi Muta, Masakuni Okubo, Akira Mochizuki, Hiroshi Adachi