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Expired European patentEurope

A digital effects loop for video switchers

EP 0239243 B1 · Applicant: AMPEX SYSTEMS CORPORATION

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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 February 24, 1987 and granted February 2, 1994. A European patent lasts at most 20 years from filing, so its term ended February 24, 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 24, 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 24, 1987
PublishedSeptember 30, 1987
GrantedFebruary 2, 1994
Term endedFebruary 24, 2007
Application numberEP 87301575
Classification (CPC)H04N5/268

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedFeb 24, 1987PublishedSep 30, 1987Patent grantedFeb 2, 1994Term endedFeb 24, 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.