Patents by Inventor Hirosi Nakagawa

Hirosi Nakagawa 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).

  • Method and system for checking sealed containers for pinholes by comparing two discharge currents
    Patent number: 4243932
    Abstract: A method of and a system for checking sealed containers for pinholes with contents enclosed therein by placing a sealed container between first and second electrodes, impressing voltage across the first electrode and second electrodes to generate two discharge current flows on the container and between the first electrode and second electrode respectively, detecting the discharge currents individually and converting the difference between the detected values to a detection signal value.
    Type: Grant
    Filed: March 27, 1978
    Date of Patent: January 6, 1981
    Assignee: Otsuka Pharmaceutical Factory Inc.
    Inventors: Michio Kakumoto, Eizi Oe, Hirosi Nakagawa