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Expired European patentEurope

Aqueous cleaning emulsion

EP 0052275 B1 · Applicant: E.I. DU PONT DE NEMOURS AND COMPANY

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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 28, 1981 and granted November 6, 1985. A European patent lasts at most 20 years from filing, so its term ended October 28, 2001.
  • 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 28, 2007.
  • 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 28, 1981
PublishedMay 26, 1982
GrantedNovember 6, 1985
Term endedOctober 28, 2001
Application numberEP 81109110
Classification (CPC)C23G5/06

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedOct 28, 1981PublishedMay 26, 1982Patent grantedNov 6, 1985Term endedOct 28, 2001

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.