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:
Feb. 03, 1976
Filed:
Jul. 24, 1974
Applicant:
Inventors:
Yoshihide Miyazawa, Tokyo, JA;
Minoru Ozutsumi, Tokyo, JA;
Satoshi Ogawa, Tokyo, JA;
Keiso Saeki, Fuojimiya, JA;
Akio Watanabe, Fuojimiya, JA;
Assignees:
Hodogaya Chemical Co., Ltd., Tokyo, JA;
Fuji Photo Film Co., Ltd., Minami-ashigara, JA;
Primary Examiner:
Int. Cl.
CPC ...
B41M / ;
U.S. Cl.
CPC ...
428307 ; 282 275 ; 427145 ; 427261 ; 428323 ; 428325 ; 428454 ;
Abstract
A pressure-sensitive copying paper comprising an adsorbent solid acid and a microencapsulated color former capable of forming a distinct color when reacted with the adsorbent acid coated on the same or a different surface of a support or supports, the microencapsulated color former being at least one lactone compound of a pyridine-carboxylic acid represented by the formula ##SPC1## Or a mixture thereof, wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and A are as defined hereinafter, is disclosed.