Patents by Inventor Toshihiro Tsubota

Toshihiro Tsubota 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).

  • Patent number: 8288006
    Abstract: An artificial leather comprising a protective layer, a surface layer, and a fibrous substrate, successively laminated, wherein a polyurethane resin forming the surface layer is obtained by reacting a urethane polyisocyanate prepolymer (A) and a polyol component (C) containing a urethane polyol prepolymer (B), the (A) has an equivalent ratio (isocyanate groups/hydroxyl groups) of from 2.0 to 6.0, and has a number average molecular weight of from 3,000 to 30,000, the (B) has an equivalent ratio (isocyanate groups/hydroxyl groups) of from 0.2 to 0.8, and has a number average molecular weight of from 3,000 to 30,000, an equivalent ratio between the urethane polyisocyanate prepolymer (A) and the polyol component (C) (isocyanate groups/active hydrogen groups) is from 1.01 to 2.0, and a weight ratio between the urethane polyisocyanate prepolymer (A) and the polyol component (C) ((A)/(C)) is from 0.7 to 2.0.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: October 16, 2012
    Assignee: Seiren Co., Ltd.
    Inventor: Toshihiro Tsubota
  • Publication number: 20100239846
    Abstract: An artificial leather comprising a protective layer, a surface layer, and a fibrous substrate, successively laminated, wherein a polyurethane resin forming the surface layer is obtained by reacting a urethane polyisocyanate prepolymer (A) and a polyol component (C) containing a urethane polyol prepolymer (B), the (A) has an equivalent ratio (isocyanate groups/hydroxyl groups) of from 2.0 to 6.0, and has a number average molecular weight of from 3,000 to 30,000, the (B) has an equivalent ratio (isocyanate groups/hydroxyl groups) of from 0.2 to 0.8, and has a number average molecular weight of from 3,000 to 30,000, an equivalent ratio between the urethane polyisocyanate prepolymer (A) and the polyol component (C) (isocyanate groups/active hydrogen groups) is from 1.01 to 2.0, and a weight ratio between the urethane polyisocyanate prepolymer (A) and the polyol component (C) ((A)/(C)) is from 0.7 to 2.0.
    Type: Application
    Filed: February 26, 2010
    Publication date: September 23, 2010
    Inventor: Toshihiro Tsubota