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:
Aug. 24, 1982
Filed:
Mar. 27, 1980
Applicant:
Inventors:
Mamoru Nakasuji, Yokohama, JP;
Hirotsugu Wada, Machida, JP;
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ;
U.S. Cl.
CPC ...
313336 ; 3133 / ;
Abstract
An electron gun for a shaped beam type electron beam delineating system is provided with a cathode which is prepared from a single crystal of lanthanum hexaboride (LaB.sub.6) the convex end portion of which has a tip radius ranging between 260 and 1,000 microns. The electron gun of the invention has a long effective life for producing a stable electron beam which can irradiate a limiting aperture with a uniform current density and insures the sufficiently high brightness of the electron beam image projected on a target.
Nakasuji, Mamoru. (1982). Electron gun (U.S. Patent No. 4346325). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4346325
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile