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. 28, 1992
Filed:
Mar. 04, 1991
Applicant:
Inventors:
Michihiro Watanabe, Tsuchiura, JP;
Kazutaka Sato, Kashiwa, JP;
Munetoshi Zen, Kashiwa, JP;
Kazuhiko Ato, Mito, JP;
Yoshinobu Watanabe, Hiratsuka, JP;
Sadayoshi Taguchi, Hadano, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Tanaka Matthey Co., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01D / ; B32B / ; B32B / ; H01B / ;
U.S. Cl.
CPC ...
346 / ; 428428 ; 428432 ; 428433 ;
Abstract
A thermal head obtained by calcining a mixed material comprising at least ruthenium oxide particles having specific surface area of 10 to 45 m.sup.2 /g and a particle size of 1 .mu.m as the upper limit value of particle size distribution, glass fine particles and a dispersant which disperses these fine particles and disappears by calcining can reduce scattering of resistance values and give high image quality at thermal printing.