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Expired European patentEurope

Tungsten oxo-porphyrin complexes

EP 0283754 B1 · Applicant: Degussa Aktiengesellschaft

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Overview

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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.

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Why it's free to use

  • Filed February 25, 1988 and granted February 2, 1994. A European patent lasts at most 20 years from filing, so its term ended February 25, 2008.
  • 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 August 25, 2013.
  • 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.
FiledFebruary 25, 1988
PublishedSeptember 28, 1988
GrantedFebruary 2, 1994
Term endedFebruary 25, 2008
Application numberEP 88102770
Classification (CPC)C07D487/22 +1 more

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedFeb 25, 1988PublishedSep 28, 1988Patent grantedFeb 2, 1994Term endedFeb 25, 2008

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

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