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:
Apr. 21, 1981
Filed:
Aug. 22, 1979
Akihiro Yamaguchi, Yokohama, JP;
Tadashi Kobayashi, Yokohama, JP;
Kenzaburo Yamuguchi, Kawasaki, JP;
Hisamichi Murakami, Yokohama, JP;
Noboru Yamato, Tokyo, JP;
Akira Hasegawa, Tokyo, JP;
Mitsui Toatsu Chemicals, Incorporated, Tokyo, JP;
Jujo Paper Co., Ltd., Tokyo, JP;
Abstract
A color-developing sheet for pressure-sensitive recording sheets, said sheet comprising as a color-developing agent at least one 2,2'-bisphenolsulfone nickel salt selected from compounds of the following formula ##STR1## wherein R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 are identical or different, and represent a hydrogen atom, a halogen atom, an alkyl group containing 1 to 10 carbon atoms, a cycloalkyl group containing 3 to 10 carbon atoms, an aralkyl group containing 7 to 11 carbon atoms, or a phenyl group, or a mixture of at least one 2,2'-bisphenolsulfone nickel salt of the above formulae (II) and (III) and at least one 2,2'-bisphenolsulfone zinc salt of the following formula ##STR2## wherein R.sub.1 and R.sub.2 are the same as R.sub.3 through R.sub.8 defined above.