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Expired European patentEurope

Process for removing organic impurities from phosphoric acid

EP 0016996 B1 · Applicant: HOECHST 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 March 6, 1980 and granted July 21, 1982. A European patent lasts at most 20 years from filing, so its term ended March 6, 2000.
  • 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 September 6, 2005.
  • 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.
FiledMarch 6, 1980
PublishedOctober 15, 1980
GrantedJuly 21, 1982
Term endedMarch 6, 2000
Application numberEP 80101135
Classification (CPC)C01B25/235

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedMarch 6, 1980PublishedOct 15, 1980Patent grantedJuly 21, 1982Term endedMarch 6, 2000

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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