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:
Nov. 22, 1994
Filed:
May. 06, 1992
Applicant:
Inventor:
Eiji Sugawara, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ; H04M / ; H04J / ;
U.S. Cl.
CPC ...
379252 ; 379 32 ; 379134 ; 370 681 ;
Abstract
A subscriber apparatus having working ringer generators and a standby ringer generator which is alternately used when there is a fault, wherein provision is made of a traffic monitoring unit which continuously monitors the traffic of calls terminating at the subscriber lines and a ringer switching unit which switches a working ringer generator to a standby ringer generator when it is judged that the number of the terminating calls exceeds an allowable number, whereby the apparent capacity of the working ringer generators is increased.