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:
Jan. 03, 1984
Filed:
Feb. 24, 1982
Keiichi Maruta, Numazu, JP;
Yukihiro Yuyama, Numazu, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A thermosensitive-recording-type label sheet comprising a support material; a thermosensitive coloring layer formed on the front side of the support material, the thermosensitive coloring layer comprising a leuco dye and an acidic material capable of coloring the leuco dye when heat is applied thereto; and a barrier layer formed on the back side of said support material, opposite to the thermosensitive coloring layer, the barrier layer comprising a water-soluble polymeric material and a water-repellent wax or wax-like material and capable of preventing intrusion into the thermosensitive coloring layer of materials which may discolor the thermosensitive coloring layer; and an adhesive layer formed on said barrier layer. In this label sheet, the wax or wax-like material contained in the barrier layer plays an important role of protecting the thermosensitive coloring layer during the production of the label sheet as well as while in use.