Patents by Inventor Kiyoshi B. Sagawa

Kiyoshi B. Sagawa 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).

  • Hardening of poly(vinyl acetal)
    Patent number: 4558003
    Abstract: The addition of a boric acid or borate ion to a poly(vinyl acetal) composition has been found to cause hardening of the composition. The hardened composition is particularly useful in photothermographic emulsions having a poly(vinyl acetal) layer.
    Type: Grant
    Filed: March 12, 1984
    Date of Patent: December 10, 1985
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Kiyoshi B. Sagawa