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. 21, 1984
Filed:
Jun. 04, 1982
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An improved thermosensitive recording material comprising a support material is disclosed and a thermosensitive coloring layer formed on the support material, the thermosensitive coloring layer comprising (a) a colorless or light-colored coloring material and (b) a developing material capable of coloring the coloring material upon application of heat thereto, said developing material comprising a p-hydroxybenzoic acid ester of the formula (I) and a bisphenol derivative of the formula (II), with a melting point ranging from 80.degree. C. to 130.degree. C., the formulas (I) and (II) being: ##STR1## wherein R represents alkyl having 1 to 4 carbon atoms, or benzyl, ##STR2## wherein R.sup.1 represents hydrogen or methyl; R.sup.2 represents hydrogen or alkyl having 1 to 5 carbon atoms; R.sup.3 represents hydrogen or methyl; and R.sup.4 represents hydrogen or alkyl having 1 to 4 carbon atoms.