Patents Examined by Virginia Manharan
  • Perforated tray column without downcomer
    Patent number: 7235158
    Abstract: A perforated tray without downcomer having only a small deviation between the opening ratio based on the diameter of a column and the actual opening ratio and a perforated tray column without downcomer formed by disposing such perforated trays without downcomer are provided. The perforated trays without downcomer are characterized by having a ratio of (A)/(B) in the range of 1.1-1.5, wherein A denotes the opening ratio found from the standard pitch between centers of holes and (B) denotes the opening ratio based on the diameter of a column.
    Type: Grant
    Filed: July 17, 2002
    Date of Patent: June 26, 2007
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Yukihiro Matsumoto, Kazuhiko Sakamoto, Kenji Sanada