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Expired European patentEurope

Heating silica gel in inert atmosphere before activation

EP 0085357 B1 · Applicant: PHILLIPS PETROLEUM 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 19, 1983 and granted May 30, 1990. A European patent lasts at most 20 years from filing, so its term ended January 19, 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 July 19, 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.
FiledJanuary 19, 1983
PublishedAugust 10, 1983
GrantedMay 30, 1990
Term endedJanuary 19, 2003
Application numberEP 83100434
Classification (CPC)B01J21/063 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedJan 19, 1983PublishedAug 10, 1983Patent grantedMay 30, 1990Term endedJan 19, 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

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