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Expired European patentEurope

Vitreous silica

EP 0335875 B1 · Applicant: TSL GROUP PLC

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 November 19, 1987 and granted August 4, 1993. A European patent lasts at most 20 years from filing, so its term ended November 19, 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 May 19, 2013.
  • 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.
FiledNovember 19, 1987
PublishedOctober 11, 1989
GrantedAugust 4, 1993
Term endedNovember 19, 2007
Application numberEP 87907437
Classification (CPC)C03C1/00 +2 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedNov 19, 1987PublishedOct 11, 1989Patent grantedAug 4, 1993Term endedNov 19, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.