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Expired European patentEurope

Acoustic transducer with improved low frequency response

EP 0775434 B1 · Applicant: THE CHARLES STARK DRAPER LABORATORY, 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 12, 1995 and granted August 8, 2007. A European patent lasts at most 20 years from filing, so its term ended June 12, 2015.
  • 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 12, 2020.
  • 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 12, 1995
PublishedMay 28, 1997
GrantedAugust 8, 2007
Term endedJune 12, 2015
Application numberEP 95923850
Classification (CPC)H04R19/005

Timeline

Timeline From EPO dates

1996199820002002200420062008201020122014Application filedJune 12, 1995PublishedMay 28, 1997Patent grantedAug 8, 2007Term endedJune 12, 2015

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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