Patent Yard Sign in
Expired European patentEurope

Annunciator of danger

EP 0004909 B1 · Applicant: SIEMENS AKTIENGESELLSCHAFT

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.

Google PatentsEPO PDF

Why it's free to use

  • Filed April 4, 1979 and granted January 27, 1982. A European patent lasts at most 20 years from filing, so its term ended April 4, 1999.
  • A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by October 4, 2004.
  • We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledApril 4, 1979
PublishedOctober 31, 1979
GrantedJanuary 27, 1982
Term endedApril 4, 1999
Application numberEP 79101028
Classification (CPC)G08B26/006

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedApril 4, 1979PublishedOct 31, 1979Patent grantedJan 27, 1982Term endedApril 4, 1999

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.