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Expired European patentEurope

Corrosion inhibitors for aqueous solutions for the treatment of metals, and process for their preparation

EP 0109548 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 October 19, 1983 and granted July 13, 1988. A European patent lasts at most 20 years from filing, so its term ended October 19, 2003.
  • 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 19, 2009.
  • 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 19, 1983
PublishedMay 30, 1984
GrantedJuly 13, 1988
Term endedOctober 19, 2003
Application numberEP 83110409
Classification (CPC)C10M173/02 +1 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedOct 19, 1983PublishedMay 30, 1984Patent grantedJuly 13, 1988Term endedOct 19, 2003

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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