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Expired European patentEurope

Process for making aerated concrete

EP 0241473 B1 · Applicant: DE CHIFFRE, Chiara

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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 January 30, 1986 and granted September 20, 1989. A European patent lasts at most 20 years from filing, so its term ended January 30, 2006.
  • 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 July 30, 2011.
  • 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.
FiledJanuary 30, 1986
PublishedOctober 21, 1987
GrantedSeptember 20, 1989
Term endedJanuary 30, 2006
Application numberEP 86901122
Classification (CPC)C04B28/02

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedJan 30, 1986PublishedOct 21, 1987Patent grantedSep 20, 1989Term endedJan 30, 2006

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.