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:
Jan. 08, 1991
Filed:
Sep. 11, 1989
Takeshi Kiso, Kanagawa, JP;
Takanori Masuda, Shizuoka, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
To measure the period with which a surface defect recurs in a surface of a web-like material moving in its lengthwise direction, surface defects distributed over the surface are detected in that lengthwise direction. Positional data and distance data as to the detected surface defects relative to one another are collected for a predetermined length of the web-like material. The web-like material is determined to have a periodic surface defect appearing with a period between predetermined maximum and minimum periods when the distance data include a distance equivalent to an elemental period that is a whole-number multiple of a fundamental period.