Patents by Inventor Yoshimitu Tanabe

Yoshimitu Tanabe 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).

  • Color-developer for pressure-sensitive recording sheets
    Patent number: 4400492
    Abstract: Disclosed is a color-developer for pressure-sensitive recording sheets, comprising a co-condensate of a reaction intermediate of a p-substituted phenol and a trifunctional or higher phenol, or a polyvalent metal salt of said co-condensate, said reaction intermediate being obtained by the reaction of said p-substituted phenol under acidic conditions with formaldehyde or a substance capable of generating formaldehyde.
    Type: Grant
    Filed: March 24, 1981
    Date of Patent: August 23, 1983
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Makoto Asano, Saburo Kawashima, Yoshimitu Tanabe, Hisamichi Murakami
  • Color-developer for pressure-sensitive sheets
    Patent number: 4379897
    Abstract: Disclosed is a color-developer for pressure-sensitive recording sheets, comprising a co-condensate of a reaction intermediate of a p-substituted phenol and a trifunctional or higher phenol, or a polyvalent metal salt of said co-condensate, said reaction intermediate being obtained by the reaction of said p-substituted phenol under alkaline conditions with formaldehyde or a substance capable of generating formaldehyde.
    Type: Grant
    Filed: March 17, 1981
    Date of Patent: April 12, 1983
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Makoto Asano, Yoshimitu Tanabe, Hisamichi Murakami