Patents by Inventor Eisaburo Kaku

Eisaburo Kaku 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).

  • Thermoresponsive recording paper sheet
    Patent number: 4605940
    Abstract: There is provided a thermoresponsive paper sheet comprising a normally colorless or pale-colored chromogenic substance in combination with a phenolic compound and the underlying paper substrate, said sheet further comprises a diether of the formula: ##STR1## wherein R.sup.4 is alkyl of 1 to 5 carbon atoms, benzyl or phenethyl.
    Type: Grant
    Filed: September 11, 1984
    Date of Patent: August 12, 1986
    Assignee: Yoshitomi Pharmaceutical Industries, Ltd.
    Inventors: Ryoichi Kinishi, Eisaburo Kaku, Naoki Hanayama
  • Thermoresponsive recording sheet
    Patent number: 4558335
    Abstract: There is disclosed the use of benzyl 4-benzyloxybenzoate as a responsiveness-increasing agent in a thermoresponsive recording paper sheet comprising a normally colorless or pale-colored chromogenic substance in combination with a phenolic compound.
    Type: Grant
    Filed: March 11, 1982
    Date of Patent: December 10, 1985
    Assignee: Yoshitomi Pharmaceutical Industries, Ltd.
    Inventors: Naoki Hanayama, Eisaburo Kaku, Ryoichi Kinishi