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:
Apr. 06, 1982
Filed:
Dec. 19, 1979
Koichi Uno, Nagoya, JP;
Shinichi Murakami, Nagoya, JP;
Narumi China Corporation, Nagoya, JP;
Abstract
A hermetic cap member of a casing for a semiconductor memory element is provided with a protection layer on a recessed surface facing the memory element. The protection layer is of at least one material which does not emit alpha particles and has a thickness sufficient to prevent alpha particles from being emitted from the cap member onto the memory element. Specifically, the protection layer may be a plate of a pertinent one of the following silicon of high purity, 42 alloy, or Kovar and is attached to the cap member by the use of an adhesive of glass frit. Alternatively, the protection layer may be made from a metallic paste of silver, silver-palladium, or gold-palladium by firing the same onto the cap member. The protection layer may also be magnesium oxide formed by the use of a plasma spray process. As a further alternative, the protection layer may consist of a plurality of materials.