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:
Jan. 14, 1997
Filed:
Sep. 07, 1995
Kazutoshi Kawamura, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
In an order wire as an auxiliary line for use in the installation and maintenance of communication equipment, a method of producing a ring-back tone includes of transmitting a DTMF signal on the side of the calling station, causing a call-in tone to be produced, on the side of the called station, when a specific condition is satisfied, transmitting a ring-back tone signal, on the side of the called station, containing data related to the station number of the calling station, and causing a ring-back tone to be produced, on the side of the calling station, when a specific condition is satisfied. By using the method, the ring-back tone is produced only in the calling station without the need for an exchange apparatus.