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:
Sep. 03, 2002
Filed:
Oct. 01, 1999
Applicant:
Inventor:
Ken Matsumoto, Utsunomiya, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01B 1/100 ; G06K 7/14 ;
U.S. Cl.
CPC ...
G01B 1/100 ; G06K 7/14 ;
Abstract
A code reading device includes an illuminator which illuminates a code formed on a substrate with light, a reflector which reflects the light to allow the light to pass through the code at least two times, and a detector which detects the reflected light to read the code on the substrate. The substrate is one of a photomask, a reticle, a wafer and a glass plate.