Electricity: conductors and insulators – Boxes and housings – With electrical device
Reexamination Certificate
2011-05-10
2011-05-10
Ngo, Hung V (Department: 2835)
Electricity: conductors and insulators
Boxes and housings
With electrical device
C310S344000, C310S348000, C310S369000
Reexamination Certificate
active
07939768
ABSTRACT:
A crystal unit includes a unit base in which a metal flange is welded to an outer circumference of a base main body, a crystal element held by supporters on the unit base, and a metal cover that is jointed to the metal flange to cover and hermetically encapsulate the crystal element. The base main body is formed of ceramic. A first metal film, to which the metal flange is joined, is formed on a surface of the outer circumference of the base main body. At least two places of the main body, second metal films are formed on an inner bottom face of the main body, and third metal films are formed on an outer bottom face of the main body. The second metal films and the third metal films are electrically connected to one another through via holes. The supporters are joined to the second metal films.
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Hara Kouichi
Obara Shigeru
Blackman William D.
Carrier Joseph P.
Carrier Blackman & Associates P.C.
Ngo Hung V
Nihon Dempa Kogyo Co. Ltd.
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