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, 1999
Filed:
Apr. 15, 1998
Applicant:
Inventor:
Taizo Nakamura, Kawasaki, JP;
Assignee:
Mitutoyo Corporation, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01B / ;
U.S. Cl.
CPC ...
356384 ; 356378 ; 356386 ;
Abstract
A light beam from a light source is formed into an annular beam and an inner wall of a hole in an object is illuminated with the annular beam. The annular beam reflected from the inner wall of the hole is received as an annular image and a diameter of the annular image is measured, from which an inner diameter of the hole can be determined