Patents by Inventor Shigeyuki Kawai

Shigeyuki Kawai 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).

  • Solar radiation energy absorber
    Patent number: 4195124
    Abstract: A solar energy absorber consisting of a metallic copper or copper alloy substrate and a black to dark brown copper oxide coating on its surface. The copper oxide coating is formed by treating the surface of the substrate with an aqueous alkaline solution containing peroxodisulfuric acid or an inorganic peroxodisulfate. The solution may be activated by adding an oxidizing agent or applying ultraviolet or ultrasonic irradiation.
    Type: Grant
    Filed: April 21, 1977
    Date of Patent: March 25, 1980
    Assignee: Sekisui Kagaku Kogyo Kabushiki Kaisha
    Inventors: Hiroshi Doi, Shiyuichiro Ochiai, Shigeyuki Kawai, Kazuaki Miyamoto, Tadashi Sasaki