The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 28, 1992
Filed:
Dec. 18, 1990
Applicant:
Inventors:
Morihisa Machida, Hayama, JP;
Yoshio Tajima, Ito, JP;
Hideo Nakatsumi, Ichikawa, JP;
Tatsuo Isahai, Takasaki, JP;
Daijiro Shiroki, Nagareyama, JP;
Assignees:
The Yokohama Rubber Co., Ltd., Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A41D / ;
U.S. Cl.
CPC ...
2168 ; 2167 ;
Abstract
A laminate comprising an inner layer containing an acid/base indicator and an outer layer containing no acid/base indicator, wherein the inner layer is capable of undergoing a color change upon its contact with an acid or an alkali.