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Expired European patentEurope

Acidizing method

EP 0265563 B1 · Applicant: UNION OIL COMPANY OF CALIFORNIA

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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 October 30, 1986 and granted May 8, 1991. A European patent lasts at most 20 years from filing, so its term ended October 30, 2006.
  • 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 April 30, 2012.
  • 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.
FiledOctober 30, 1986
PublishedMay 4, 1988
GrantedMay 8, 1991
Term endedOctober 30, 2006
Application numberEP 86308480
Classification (CPC)C09K8/74

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedOct 30, 1986PublishedMay 4, 1988Patent grantedMay 8, 1991Term endedOct 30, 2006

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.