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Expired European patentEurope

Method for the production of high pore volume alumina powders

EP 0012152 B1 · Applicant: Conoco Inc.

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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 July 19, 1979 and granted December 7, 1983. A European patent lasts at most 20 years from filing, so its term ended July 19, 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 January 19, 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.
FiledJuly 19, 1979
PublishedJune 25, 1980
GrantedDecember 7, 1983
Term endedJuly 19, 1999
Application numberEP 79102554
Classification (CPC)C01F7/448 +1 more

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedJuly 19, 1979PublishedJune 25, 1980Patent grantedDec 7, 1983Term endedJuly 19, 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.