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Expired European patentEurope

Method of inhibiting precipitation of salts from water dispersed in oil and compositions containing polymeric antiprecipitants

EP 0030425 B1 · Applicant: CYANAMID OF GREAT BRITAIN, LIMITED

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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 November 21, 1980 and granted July 11, 1984. A European patent lasts at most 20 years from filing, so its term ended November 21, 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 May 21, 2006.
  • 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.
FiledNovember 21, 1980
PublishedJune 17, 1981
GrantedJuly 11, 1984
Term endedNovember 21, 2000
Application numberEP 80304179
Classification (CPC)C09K8/54 +2 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedNov 21, 1980PublishedJune 17, 1981Patent grantedJuly 11, 1984Term endedNov 21, 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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