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:
Aug. 23, 1994
Filed:
Jul. 27, 1992
Shojiro Sano, Shizuoka, JP;
Ken Iwakura, Shizuoka, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A method of optically reading colored record images formed by the reaction of a substantially colorless electron donating dye and an electron accepting developer in a pressure-sensitive recording sheet with a red light having a wavelength of from 620 nm to 700 nm, wherein the pressure-sensitive recording sheet comprises an electron accepting developer layer containing a metal salt of an aromatic carboxylic acid as the electron accepting developer and an electron donating dye layer containing a phthalide compound represented by the following formula (1) as the electron donating dye: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 each represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; the R.sub.1 and R.sub.2 or the R.sub.3 and R.sub.4 may combine with each other to form a ring; R.sub.5 represents a hydrogen atom or an alkyl group; R6, R.sub.7, R.sub.8, and R.sub.9 each represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a substituted amino group, or an alicyclic amino group; and X and Y each represents a hydrogen atom, an alkyl group, or an alkoxy group.