Patents by Inventor Haruo Kohama

Haruo Kohama 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).

  • Indicator for ethylene oxide gas
    Patent number: 4094642
    Abstract: An indicator composition for ethylene oxide gas comprises 4-(4-nitrobenzyl) pyridine, nitrocellulose, a basic substance, and, optionally, a blue coloring agent.The indicator composition, when exposed to ethylene oxide gas, changes its color to develop a stable color indication, typically of a green color. The composition can take any shape and form, and is typically applied to a substrate such as paper to form a layer thereon.
    Type: Grant
    Filed: February 15, 1977
    Date of Patent: June 13, 1978
    Assignee: Dai Nippon Insatsu Kabushiki Kaisha
    Inventors: Mitsuhiro Sumimoto, Haruo Kohama