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Expired European patentEurope

Wavelength tunable laser with multiple ring resonator

EP 1699120 B1 · Applicant: NEC 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 March 2, 2006 and granted October 15, 2008. A European patent lasts at most 20 years from filing, so its term ended March 2, 2026.
  • Supplementary protection certificates extend only medicine and crop-protection patents, and it isn't classified as either.
  • 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.
FiledMarch 2, 2006
PublishedSeptember 6, 2006
GrantedOctober 15, 2008
Term endedMarch 2, 2026
Application numberEP 06004238
Classification (CPC)H01S5/0612 +2 more

Timeline

Timeline From EPO dates

2007200920112013201520172019202120232025Application filedMarch 2, 2006PublishedSep 6, 2006Patent grantedOct 15, 2008Term endedMarch 2, 2026

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.