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Expired European patentEurope

Impregnated active carbon for the filtration of cyanogen chlorides, and its preparation process

EP 0143027 B1 · Applicant: ETAT-FRANCAIS représenté par le DELEGUE GENERAL POUR L'ARMEMENT (DPAG)

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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 11, 1984 and granted December 17, 1986. A European patent lasts at most 20 years from filing, so its term ended October 11, 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 April 11, 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.
FiledOctober 11, 1984
PublishedMay 29, 1985
GrantedDecember 17, 1986
Term endedOctober 11, 2004
Application numberEP 84402040
Classification (CPC)C01B32/342 +1 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedOct 11, 1984PublishedMay 29, 1985Patent grantedDec 17, 1986Term endedOct 11, 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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