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:
Feb. 22, 1994
Filed:
Nov. 27, 1991
Masanori Takano, Kawasaki, JP;
Toshihiro Yabe, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An in-house paging system includes a call controller connected to an in-house switching unit for providing an interfacing process in response to a call request from an extension terminal. A plurality of transmitting units are connected to the call controller through a signal line and a power source line. A pager terminal is provided for notifying a maintenance staff of a call signal from a transmitting unit on receipt of the signal. The transmitting unit comprises a detecting unit for detecting whether or not an abnormal condition arises in a signal line or a power source line to a call controller and a signal/power-source line abnormal signal transmitting unit for transmitting abnormal condition information to the pager terminal when the detecting unit detects an abnormal condition in the signal line or the power source line. A battery as a backup power supply unit is used in case of power disconnection.