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:
Feb. 26, 1985
Filed:
Jun. 28, 1982
Applicant:
Inventor:
Nikolaos Douklias, Kirchheim, DE;
Assignee:
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ; G01N / ;
U.S. Cl.
CPC ...
356 731 ; 65 29 ; 65160 ;
Abstract
A method and device for testing specimens, such as optical fibers or preforms from which optical fibers are produced, to discover defects in the specimen includes creating a spatial frequency spectrum of the specimen, filtering the spectrum by projecting it onto a spatial frequency filter and evaluating the portion or component of the spectrum passing through the filter.