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:
May. 13, 1986
Filed:
Sep. 21, 1984
Nicholas J Carter, Shelton, CT (US);
Douglas Sutherland, Shelton, CT (US);
ITT Corporation, New York, NY (US);
Abstract
An intercommunication system makes use of existing quad wiring to provide intercom communication between the subsets of the system, as well as communication with a standard central office, or an 'outside line'. Each subset is provided with a control sequencer for selectively connecting the set to either an 'intercom' or an 'outside' or C.O. line. When the handset of a subset is lifted off the respective hookswitch, the subset is automatically connected to intercom line and signalling between subsets can occur with the outside line on 'hold'. The hold is released automatically when another handset is picked up. Two indicators show activity on the two lines respectively.