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:
May. 09, 1978
Filed:
Feb. 19, 1976
Joseph Dresner, Princeton, NJ (US);
Bernard Goldstein, Princeton, NJ (US);
RCA Corporation, New York, NY (US);
Abstract
A layer of near stoichiometric magnesium oxide on a conducting substrate forms a dynode. The dynode is formed by preparing a layer of oxidized magnesium on a conducting substrate, heating the oxidized magnesium layer in a vacuum between about 400.degree. and about 500.degree. C., and treating the layer to render it more nearly stoichiometric. One method of treating the layer is to expose it to oxygen at about room temperature for about ten to twenty minutes at a pressure between about 10.sup.-6 to 10.sup.-5 torr. Another method of treating the layer is to impinge a noble gas, such as argon, at a pressure suitable for sputter etching, such as between 10.sup.-6 and 10.sup.-3 torr, to remove between ten and twenty atomic layers from the surface of the layer. The layer is then exposed to oxygen at room temperature for about ten to twenty minutes at a pressure between about 10.sup.-6 and 10.sup.-5 torr.