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:
Aug. 25, 1981
Filed:
Apr. 13, 1979
Karlheinz Schreyer, Wolfratshausen, DE;
Peer Thilo, Munich, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
A danger alarm system has a plurality of alarm circuits which are operable to provide environmental signals concerning the area about the respective alarm circuits. The alarm circuits are connected to a central exchange by way of respective lines which are terminated in the exchange by respective alarm connection circuits. A write-read memory is provided for storing the busy state of the respective lines, and receives the busy state information via an input multiplexer which is connected to a line state multiplexer through a plurality of logic gates. A comparator gates through alarm and line interrupt signals for each line in response to such signals together with busy condition signals from the memory. An output multiplexer connects the comparator to respective output indicator circuits for alarm conditions and line interrupt conditions.