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Expired European patentEurope

Colorimetric measuring method for zinc

EP 0147660 B1 · Applicant: WAKO PURE CHEMICAL INDUSTRIES, LTD.

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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 November 29, 1984 and granted November 8, 1989. A European patent lasts at most 20 years from filing, so its term ended November 29, 2004.
  • 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 May 29, 2010.
  • 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.
FiledNovember 29, 1984
PublishedJuly 10, 1985
GrantedNovember 8, 1989
Term endedNovember 29, 2004
Application numberEP 84114486
Classification (CPC)G01N31/22 +1 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedNov 29, 1984PublishedJuly 10, 1985Patent grantedNov 8, 1989Term endedNov 29, 2004

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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