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Expired European patentEurope

Decelerating and scan expansion lens system for electron discharge tube

EP 0236740 B1 · Applicant: TEKTRONIX, INC.

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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 February 5, 1987 and granted November 6, 1991. A European patent lasts at most 20 years from filing, so its term ended February 5, 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 August 5, 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.
FiledFebruary 5, 1987
PublishedSeptember 16, 1987
GrantedNovember 6, 1991
Term endedFebruary 5, 2007
Application numberEP 87101552
Classification (CPC)H01J29/803

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedFeb 5, 1987PublishedSep 16, 1987Patent grantedNov 6, 1991Term endedFeb 5, 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.