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. 08, 1990
Filed:
Jan. 28, 1988
Applicant:
Inventors:
Akio Saito, Tokyo, JP;
Masahiro Ishigami, Saitama, JP;
Assignee:
NEC Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03G / ; H04B / ;
U.S. Cl.
CPC ...
330284 ; 381 86 ;
Abstract
A volume control circuit for a portable telephone set has two volume setting circuits. One of these circuits is activated when the telephone is used within a vehicle and the other is activated when the telephone is removed from the vehicle and carried about as a personal telephone. One embodiment selects between these two circuits by operating mechanical structures which are moved between two positions by physically attaching or removing the telephone to or from the vehicle. Another embodiment uses a microprocessor to make the selection responsive to the operation of a magnetically actuated reed switch.