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Expired European patentEurope

Matrix-encoded surround-sound channels in a discrete digital sound format

EP 1077016 B1 · Applicant: DOLBY LABORATORIES LICENSING CORPORATION

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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 30, 1999 and granted December 30, 2009. A European patent lasts at most 20 years from filing, so its term ended April 30, 2019.
  • 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 30, 2024.
  • 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 30, 1999
PublishedFebruary 21, 2001
GrantedDecember 30, 2009
Term endedApril 30, 2019
Application numberEP 99921562
Classification (CPC)H04S3/02

Timeline

Timeline From EPO dates

2000200220042006200820102012201420162018Application filedApril 30, 1999PublishedFeb 21, 2001Patent grantedDec 30, 2009Term endedApril 30, 2019

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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