Patents by Inventor Yoichi Kamimura

Yoichi Kamimura 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).

  • Permanent waving composition
    Patent number: 5116608
    Abstract: An aqueous permanent waving composition containing as a reducing agent a quaternary ammoniomercaptan or its salt of the formula: ##STR1## wherein R.sup.1, R.sup.2, and R.sup.3 are an alkyl group or a hydroxyalkyl group, A is an alkylene group, and X is a halogen atom, NO.sub.3, 1/2SO.sub.4, OH or R.sup.4 OSO.sub.3 in which R.sup.4 is an alkyl group, which can be used under an acidic, neutral or alkaline condition and can impart good waves to hairs with a little damage of the hairs and a little foul smell.
    Type: Grant
    Filed: September 25, 1989
    Date of Patent: May 26, 1992
    Assignee: Seiwa Kasei Co., Ltd.
    Inventors: Issei Yoshioka, Yoichi Kamimura, Masao Kitano, Yujiro Goto
  • Keratin hydrolyzate useful as hair fixatives
    Patent number: 4390525
    Abstract: Water-soluble keratin hydrolyzate having at least two mercapto groups in one molecule and having an average molecular weight of 2,000 to 20,000, suitable for cosmetic application to the hair, particularly as hair fixatives. The hydrolyzate is prepared by reducing keratin in an aqueous solution of a reducing agent under alkaline conditions and subjecting the resulting reduction product to enzymatic hydrolysis.
    Type: Grant
    Filed: January 6, 1981
    Date of Patent: June 28, 1983
    Assignee: Seiwa Kasei Co., Ltd.
    Inventors: Issei Yoshioka, Yoichi Kamimura
  • Keratin hydrolyzate useful as hair fixatives
    Patent number: 4279996
    Abstract: Water-soluble keratin hydrolyzate having at least two mercapto groups in one molecule and having an average molecular weight of 2,000 to 20,000, suitable for cosmetic application to the hair, particularly as hair fixatives. The hydrolyzate is prepared by reducing keratin in an aqueous solution of a reducing agent under alkaline conditions and subjecting the resulting reduction product to enzymatic hydrolysis.
    Type: Grant
    Filed: September 25, 1979
    Date of Patent: July 21, 1981
    Assignee: Seiwa Kasei Co., Ltd.
    Inventors: Issei Yoshioka, Yoichi Kamimura