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Expired European patentEurope

A method for forming stable dispersions of alumina in water and the so-obtained dispersions

EP 0025817 B1 · Applicant: Conoco Inc. (formerly called : DU PONT HOLDINGS , INC.)

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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 May 9, 1980 and granted October 3, 1984. A European patent lasts at most 20 years from filing, so its term ended May 9, 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 November 9, 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.
FiledMay 9, 1980
PublishedApril 1, 1981
GrantedOctober 3, 1984
Term endedMay 9, 2000
Application numberEP 80102593
Classification (CPC)C01F7/02

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedMay 9, 1980PublishedApril 1, 1981Patent grantedOct 3, 1984Term endedMay 9, 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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