European application, no grantEurope
Method for the supervision of the function of telecommunication exchanges, especially industrial telephone exchanges with party lines
EP 0247963 A2 · Applicant: SIEMENS AKTIENGESELLSCHAFT
Overview
The published document from the EPO: abstract, claims, description and drawings. Open it full size
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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.
Why it's free to use
- Filed May 15, 1987 and never granted as a European patent. Had it been granted, its 20-year term would have ended May 15, 2007.
- 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 November 15, 2012.
- 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.
FiledMay 15, 1987
PublishedDecember 2, 1987
GrantedNever granted
Term endedMay 15, 2007
Application numberEP 87730056
Classification (CPC)H04Q5/02 +1 more
Timeline
Timeline From EPO dates
Sources & verification
Official EPO records
Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.