Patents by Inventor Nobuyoshi Hirota

Nobuyoshi Hirota 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).

  • Coating composition for leak detection in air test
    Patent number: 4113673
    Abstract: A coating composition for leak detection in an air test, consists of an aqueous solution containing from 1.6 to 9.6 wt% of soluble starch, from 0.04 to 0.75 wt% of water-soluble acrylic resin, from 0.05 to 0.5 wt% of gelatin, and from 0.5 to 1.0 wt% of a foaming agent, and is adjusted to a pH range between 4 and 10. The composition may be adjusted to a pH range between 4 and 6. It may also be an aqueous solution containing a coagulation modifier, with the pH adjusted to a range between 8 and 10 with the addition of a small amount of caustic alkali.
    Type: Grant
    Filed: March 7, 1977
    Date of Patent: September 12, 1978
    Assignee: Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Nobuyoshi Hirota, Akio Shibata