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:
Mar. 30, 2010
Filed:
Apr. 11, 2007
Tetsuo Machida, Kanagawa, JP;
Tetsuo Machida, Kanagawa, JP;
NEC Microwave Tube, Ltd., Kanagawa, JP;
Abstract
A pillbox vacuum window of the present invention has a first metal part and a second metal part. The first metal part includes a ceramic disk formed with a metallization layer in a peripheral area thereof, a larger diameter cylindrical portion, and a smaller diameter cylindrical portion having an inner diameter smaller than that of the larger diameter cylindrical portion, and coupled to the larger diameter cylindrical portion to form a step section at a joint, where the ceramic disk is fitted into the step section. The second metal part includes a cylindrical portion, where the cylindrical portion is inserted into the step section of the first metal part while the ceramic disk is placed in the step section of the first metal part.