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Expired European patentEurope

Process for the catalytic dehydration of diols

EP 0628552 B1 · Applicant: HÜLS AKTIENGESELLSCHAFT

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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 April 11, 1994 and granted August 27, 1997. A European patent lasts at most 20 years from filing, so its term ended April 11, 2014.
  • 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 October 11, 2019.
  • 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.
FiledApril 11, 1994
PublishedDecember 14, 1994
GrantedAugust 27, 1997
Term endedApril 11, 2014
Application numberEP 94105548
Classification (CPC)C07D315/00

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedApril 11, 1994PublishedDec 14, 1994Patent grantedAug 27, 1997Term endedApril 11, 2014

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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