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Expired European patentEurope

Moisture-impervious panel capable of rapid/delayed hydration

EP 0442597 B1 · Applicant: AMERICAN COLLOID 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 January 2, 1991 and granted May 18, 1994. A European patent lasts at most 20 years from filing, so its term ended January 2, 2011.
  • 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 2, 2016.
  • 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 2, 1991
PublishedAugust 21, 1991
GrantedMay 18, 1994
Term endedJanuary 2, 2011
Application numberEP 91300003
Classification (CPC)E04C2/528

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedJan 2, 1991PublishedAug 21, 1991Patent grantedMay 18, 1994Term endedJan 2, 2011

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.