Patent Yard Sign in
Expired European patentEurope

Chemically active aqueous solution and solid substance containing ferrous ion

EP 0147464 B1 · Applicant: THE STATE OF JAPAN, as Represented by the DIRECTOR GENERAL of the AGENCY of INDUSTRIAL SCIENCE and TECHNOLOGY

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 June 18, 1983 and granted January 17, 1990. A European patent lasts at most 20 years from filing, so its term ended June 18, 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 December 18, 2008.
  • 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.
FiledJune 18, 1983
PublishedJuly 10, 1985
GrantedJanuary 17, 1990
Term endedJune 18, 2003
Application numberEP 83901940
Classification (CPC)C02F1/50 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedJune 18, 1983PublishedJuly 10, 1985Patent grantedJan 17, 1990Term endedJune 18, 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.