Patent Yard Sign in
Expired European patentEurope

A method to trap the enolate ion of the malonic acid or its derivatives

EP 0103233 B1 · Applicant: Daikin Kogyo Co., Ltd.

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed August 30, 1983 and granted November 25, 1987. A European patent lasts at most 20 years from filing, so its term ended August 30, 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 March 2, 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.
FiledAugust 30, 1983
PublishedMarch 21, 1984
GrantedNovember 25, 1987
Term endedAugust 30, 2003
Application numberEP 83108542
Classification (CPC)C07C69/65 +1 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedAug 30, 1983PublishedMarch 21, 1984Patent grantedNov 25, 1987Term endedAug 30, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.