Patents by Inventor Hirofum Hrada

Hirofum Hrada 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).

  • Lead-acid battery having an organic polymer additive and process thereof
    Patent number: 7160645
    Abstract: A process for prolonging the life of a lead-acid battery by adding an organic polymer and ultra fine lignin to its electrolyte and then discharging the battery at a high current rate and the battery so produced.
    Type: Grant
    Filed: August 5, 2003
    Date of Patent: January 9, 2007
    Inventors: Akiya Kozawa, Hirofum Hrada, Giym Yoko