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:
Nov. 02, 1993
Filed:
Dec. 12, 1991
Applicant:
Inventor:
Horst Brettschneider, Ellerau, DE;
Assignee:
U.S. Philips Corp., New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
378138 ; 378136 ; 378137 ;
Abstract
An X-ray tube has a focal spot which can be varied in respect of position or size. A cathode has dimensions adapted to the variation of the focal spot, and between the cathode and the anode of the X-ray tube there is a grid arrangement which comprises a number of grid elements in one plane, which elements are electrically insulated from one another, and whose potential is independently controlled.