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:
Jul. 13, 1982
Filed:
May. 29, 1980
Joseph Reed, Stamford, CT (US);
International Telephone and Telegraph Corporation, New York, NY (US);
Abstract
A conferencing apparatus for an FDM communications system employs a first available sideband for communication and a second sideband for signaling. Each subscriber in the system has dual receiving and transmitting equipment which enables a subscriber to communicate with any other subscriber. During such communication, a memory at each subscriber location may receive the frequency pair of one subscriber in a connection. Another subscriber desiring to be conferenced will receive the stored frequency pair from the subscriber who is not on proper frequency. This is implemented by a standby receiver and transmitter associated with each subscriber. Upon receipt of this information, the new subscriber can then tune his equipment to store the frequencies as received to enable the new subscriber to be incorporated in a conference mode. The received frequencies are also stored in the new subscriber memory and hence, any additional subscribers contacting parties to the conference will receive information regarding the elected subscriber who is communicating on his properly assigned frequencies to thereby enable a plurality of new subscribers to join in the conference.