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. 21, 1987
Filed:
Mar. 18, 1986
NEC Corporation, , JP;
Abstract
A key telephone system has a plurality of telephone sets, each set having a hold button for temporarily holding a central office ('CO') line. A plurality of cell park lamps temporarily indicate which of the CO lines is being held. A plurality of call park buttons are individually associated with the call park lamps. An outgoing call button is used for seizing an idle one of the CO lines when an outgoing call is to be initiated. An answer button is used for seizing one of the CO lines over which an incoming call is being received. At least one external indicator indicates the various states (busy, idle, holding) of each of the CO lines. A central unit has a hold control circuit for indicating with the call park lamps when the CO line is being held responsive to an operation of either the hold button or a call park button. A CO line selecting circuit is provided for selecting and seizing an idle one of the CO lines, in response to an operation of the outgoing call button, and one of the CO lines over which an incoming call is being received in response to an operation of the answer button. A CO line indication control circuit controls the external indicator to indicate the states of the CO lines.