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Expired European patentEurope

Variable gain active noise cancellation system with improved residual noise sensing

EP 0705472 B1 · Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

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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 June 23, 1994 and granted May 10, 2000. A European patent lasts at most 20 years from filing, so its term ended June 23, 2014.
  • 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 December 23, 2019.
  • 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.
FiledJune 23, 1994
PublishedApril 10, 1996
GrantedMay 10, 2000
Term endedJune 23, 2014
Application numberEP 94922444
Classification (CPC)G10K11/17853 +2 more

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedJune 23, 1994PublishedApril 10, 1996Patent grantedMay 10, 2000Term endedJune 23, 2014

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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