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:
Jun. 01, 1993
Filed:
Aug. 19, 1991
Applicant:
Inventor:
Hajime Yoshida, Tokyo, JP;
Assignee:
Hajime Industries Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
2502 / ; 356240 ;
Abstract
A light source irradiates the bottom of a bottle with light that contains visible light rays and infrared rays. Two photoelectric conversion sensors remove the light passing through the bottle bottom from the light source. An optical filter which passes only infrared rays placed in front of the light receiving surface of one of the photoelectric conversion sensors, and the outputs from the two photoelectric conversion sensors are compared directly and a signal is provided when a difference between the outputs exceeds a predetermined value.