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:
Sep. 21, 1999
Filed:
Jun. 06, 1997
Hiromi Furuya, Shimizumachi, JP;
Masafumi Torii, Shizuoka, JP;
Masaru Shimada, Shizuoka-ken, JP;
Fumio Kawamura, Shizuoka, JP;
Kyoji Tsutsui, Mishima, JP;
Katsushi Sugiyama, Inzai, JP;
Katsuaki Kokubo, Toky, JP;
Katsuhisa Kamio, Kakamigahara, JP;
Kazuo Hosoda, Miyashiro-machi, JP;
Masafumi Moriya, Kasukabe, JP;
Ricoh Company Ltd., Tokyo, JP;
Abstract
A reversible thermosensitive composition including a coloring agent and a developer and capable of assuming a colored state and a discolored state depending upon the thermal hysteresis thereof. The developer is a phenol compound represented by the formula: ##STR1## wherein R.sup.1 and R.sup.3 represent, independently from each other, a substituted or non-substituted hydrocarbon group, R.sup.2 represents a substituted or non-substituted aliphatic hydrocarbon group having at least two carbon atoms, with the proviso that the total number of carbon atoms of R.sup.1, R.sup.2 and R.sup.3 is at least 8, X and Y represent, independently from each other, a divalent group having a nitrogen atom or an oxygen atom and r is an integer of between 1 and 3.