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. 23, 1985
Filed:
Dec. 02, 1983
Applicant:
Inventors:
Satsuki Kohara, Koganei, JP;
Noriaki Ono, Akishima, JP;
Assignee:
Olympus Optical Co., Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
204416 ; 204418 ; 204419 ; 357 25 ;
Abstract
A chemical sensing element suitable for measurement of the activity or the concentration of a specific ion contained in an electrolyte is provided with an optically opaque membrane between a gate insulating membrane and an ion sensing membrane of a field-effect type transistor. Since the opaque membrane is provided, extraneous light impinging on a gate is blocked by the opaque membrane, whereby an erroneous potential due to extraneous light is prevented. Accordingly, the accurate measurement of the activity or the concentration of a specific ion contained in an electrolyte may be achieved even in intense ambient light.