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:
Apr. 25, 1978
Filed:
Jan. 14, 1977
Richard J Ullakko, Kirkland, WA (US);
Gerald L Edwards, Seattle, WA (US);
Tone Commander Systems, Inc., Redmond, WA (US);
Abstract
The system includes a central station console and one or more remote station modules. Corresponding message-waiting indicators mounted by the central station console and each remote station module are accessed and controlled from the central station on a selective individual basis; but can be controlled alternatively from the remote station modules in order to indicate message-received. Corresponding do-not-disturb indicators mounted by the central station console and each remote station module are controlled exclusively from the latter. For telephone application, the do-not-disturb indicators additionally may be operated in a flashing mode when the associated telephone set assumes off-hook condition in order to provide call status indication. The central station message-waiting and do-not-disturb indicators are connected electrically with corresponding remote station indicators by individual signalling paths, each consisting of a pair of electrical conductors along which bidirectional current flow respectively constitutes the message-waiting (or message-received) and do-not-disturb signals.