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:
Mar. 16, 1982
Filed:
Jul. 07, 1980
Henry S McDonald, Summit, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
An improved ringing control circuit in a stored program telephone switching system which provides a called subscriber an interval or window of time after answering a call to send a request for special services such as identification of the number of the calling party. This time interval, initiated when ringing is tripped, delays operation of current sensitive devices which sense current flow in the subscriber line when the party answers the call. This delays completion of the connection by the systems processor which periodically scans the conditions of the current sensitive devices. A detecting device is also provided in the control circuit to detect receipt of the request for service signal during the time interval.