Patents Assigned to Tabai Espec Corporation
  • Filtering device
    Patent number: 4944125
    Abstract: A filtering device for use in shutting out a greater portion of the ultraviolet and infrared rays but admitting the passage of visible lights indispensable to the growth of plants and human life, the device including a mixture and a container for holding the mixture, the mixture containing water, a compound dissociable into ferrous salt ions, and at least one of L-ascorbic acid and D-ascorbic acid, the container comprising transparent members disposed face to face with each other, with the mixture confined therebetween.
    Type: Grant
    Filed: May 3, 1989
    Date of Patent: July 31, 1990
    Assignee: Tabai Espec Corporation
    Inventor: Yoshio Ito