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. 05, 1994
Filed:
Dec. 30, 1992
Applicant:
Inventors:
Fujio Ishiguro, Nagoya, JP;
Hiroshi Nakajima, Nagoya, JP;
Assignee:
NGK Insulators, Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01C / ; H01C / ;
U.S. Cl.
CPC ...
338 25 ; 338269 ; 338270 ; 338275 ;
Abstract
A sensor element for a thermal type flowmeter including a ceramic substrate, a thin film, resistor of platinum provided on the outer surface of the ceramic substrate and an outer protective layer of glass provided for protecting the resistor. The glass contains Na.sub.2 O and K.sub.2 O in a total amount of up to 3 mol %. The sensor element has a temperature coefficient of resistance approximate to the bulk value of platinum, and can be fabricated with little variation.