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Expired European patentEurope

Process for preparing diorganopolysiloxanes having terminal alkoxy groups

EP 0246983 B1 · Applicant: RHONE-POULENC CHIMIE

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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 April 23, 1987 and granted September 25, 1991. A European patent lasts at most 20 years from filing, so its term ended April 23, 2007.
  • 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 October 23, 2012.
  • 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.
FiledApril 23, 1987
PublishedNovember 25, 1987
GrantedSeptember 25, 1991
Term endedApril 23, 2007
Application numberEP 87420109
Classification (CPC)C08K5/57 +1 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedApril 23, 1987PublishedNov 25, 1987Patent grantedSep 25, 1991Term endedApril 23, 2007

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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