Patents by Inventor Shigeo Yokota

Shigeo Yokota 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 device
    Patent number: 6572468
    Abstract: In a ceiling (12) of a room (10) of a clean room device (15), fan filter units (14) are arranged at distances, and to an open grid space where no fan filter unit (14) is provided, a breathable body (40) is provided. When clean air is sent from an over-ceiling space (16) into the room (10) by the fan filter unit (14), an air pressure in the room (10) becomes higher than that in the over-ceiling space (16), and part of the air in the room (10) flows to the over-ceiling space (16) through the breathable body (40). Consequently, it is possible to prevent an occurrence of a swirling current in an area under an open grid space in the room (10), and cleanliness in the room (10) can be raised.
    Type: Grant
    Filed: March 20, 2002
    Date of Patent: June 3, 2003
    Assignee: Hitachi Plant Engineering & Construction Co., Ltd.
    Inventors: Tsutomu Sasaki, Shuichi Kaijo, Shigeo Yokota, Matsuo Kamitani, Takeshi Honma