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. 28, 1989
Filed:
Sep. 25, 1987
David B Chamberlin, Monroe, CT (US);
Nicholas A D'Agosto, III, Trumbull, CT (US);
Ernest D Hoffman, Stamford, CT (US);
Dictaphone Corporation, Stratford, CT (US);
Abstract
A multiline access module for connection of a number of telephone lines to a station set. The station set is controlled by a microprocessor and communicates with the access module through a communications channel to select one telephone line for connection to the station and to read the line status, ringing, on-hook, seized, no connection, or hold, for each line; the microprocessor controlling audible and visual indicators accordingly. The access module monitors voltage levels on each line to determine the line status. Each access module includes apparatus for connection to first and second groups of telephone lines and when two modules are interconnected by an appropriately polarized cable each will activate a different connection apparatus, allowing two modules to be connected in parallel for greater line capacity.