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Expired European patentEurope

Improved process for preparing water-absorbing resins

EP 0303518 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 August 15, 1988 and granted February 17, 1993. A European patent lasts at most 20 years from filing, so its term ended August 15, 2008.
  • 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 February 15, 2014.
  • 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.
FiledAugust 15, 1988
PublishedFebruary 15, 1989
GrantedFebruary 17, 1993
Term endedAugust 15, 2008
Application numberEP 88307546
Classification (CPC)C08F220/06

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedAug 15, 1988PublishedFeb 15, 1989Patent grantedFeb 17, 1993Term endedAug 15, 2008

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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