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:
Dec. 04, 1990
Filed:
Mar. 31, 1989
Applicant:
Inventors:
Gregory T Schaeffer, Williamsport, PA (US);
John C Cipolla, Trout Run, PA (US);
Guilford R MacPhail, Williamsport, PA (US);
Assignee:
Litton Systems, Inc., Woodland Hills, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F / ; H01J / ; H01J / ;
U.S. Cl.
CPC ...
330 42 ; 313311 ; 3133 / ; 330 47 ; 445 50 ; 445 51 ;
Abstract
The present invention discloses an enhanced secondary electron emitter cathode suitable for use in a typical crossed-field amplifiers. The emitter surfaces of the cathode are formed into protuberances or knurls. The cathode's secondary emission characteristics are enhanced by providing protuberances with more surface area for electrons to bombard and for electrons to be emitted from. The protuberances increase the variety of angles of incidence of bombarding electrons thereby increasing the probability that bombarded electrons can escape the cathode's surfaces.