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:
Jan. 06, 1987
Filed:
Jul. 03, 1984
Applicant:
Inventors:
Kenneth E Williams, Andover, MA (US);
William A Frutiger, Beverly, MA (US);
Kenneth E Hall, Lynnfield, MA (US);
Assignee:
Sony Corporation, Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313342 ; 2504922 ;
Abstract
A heater for a thermionic cathode for producing an electron beam includes a central wide and a hollow cylindrical conductor with the wire disposed coaxially thereof. The wire and the cylindrical conductor are electrically connected at one end of the heater and at the other end include means for connecting to a power source. Equal electrical currents thus flow in opposite directions in the wire and the cylindrical conductor so that the magnetic fields produced thereby tending to deflect the electron beam cancel each other.