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. 15, 1992
Filed:
Apr. 08, 1991
Applicant:
Inventors:
Jakob W Mulder, Eindhoven, NL;
Goedele A Sibbens, Turnhout, BE;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G21K / ;
U.S. Cl.
CPC ...
378156 ; 378159 ;
Abstract
A lens-like X-ray filter is filled with a liquid, the filter having flexible walls, the filter being between an X-ray source and an X-ray detector in an X-ray examination apparatus. The filter obviates brightness variations in an X-ray image caused by vignetting. The filter thickness is adjustable by the supply and the discharge of a liquid, the filter preserving a quadratic thickness variation from the center to the edges.