Patents by Inventor Ikumi Ban

Ikumi Ban 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).

  • Negative active material, method of manufacturing its material, and lead acid battery
    Patent number: 7022433
    Abstract: A negative active material is characterized by being prepared by adding a lignin having a unit structure represented by the formula (I) as the main structure to a lead oxide. Since the lignin of the formula (I) is added, the negative active material can be prevented from shrinkage due to charge/discharge. (wherein R1 is H, OH, COOH, SO3H, SH, C6H5, COO?, SO3?, R2C6H4, (R2)2C6H3, or (R2)3C6H2; and R2 is at least one member selected from among OH, COOR, SO3H, and CH2SO3H.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: April 4, 2006
    Assignee: GS Yuasa Corporation
    Inventors: Hirofumi Umetani, Ikumi Ban, Yoshihiro Eguchi
  • Negative active material, method of manufacturing its material, and lead acid battery
    Publication number: 20040053130
    Abstract: A negative active material is characterized by being prepared by adding a lignin having a unit structure represented by the formula (I) as the main structure to a lead oxide. Since the lignin of the formula (I) is added, the negative active material can be prevented from shrinkage due to charge/discharge.
    Type: Application
    Filed: March 24, 2003
    Publication date: March 18, 2004
    Inventors: Hirofumi Umetani, ikumi Ban, Yoshihiro Eguchi