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. 20, 1988
Filed:
Jan. 23, 1987
Mitsutaka Hikita, Hachiouji, JP;
Atsushi Sumioka, Kokubunji, JP;
Yoshikatu Ishida, Ibaragi, JP;
Kunihiro Hamada, Koganei, JP;
Yutaka Chiba, Katsuta, JP;
Yoshio Abe, Katsuta, JP;
Hitachi Denshi Kabushiki Kaisha, both Tokyo, JP;
Hitachi Ltd., both Tokyo, JP;
Abstract
In order to reduce the size of a duplex radio communication transceiver such as a mobile telephone, this transceiver is constructed of a transmitting and receiving duplexer, a filter to be coupled to the duplexer, an amplifier for amplifying a signal received, and a filter to be connected with the output of the amplifier. All the filters are made of acoustic surface wave filters, and all the circuits are mounted on a single metallic substrate and sealed by means of a metallic casing into a module. The transceiver thus constructed has a volume which is one tenth as small as that of the device of the same kind according to the prior art.