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Expired European patentEurope

Intersubband mid-infrared electroluminescent semiconductor devices

EP 1704625 B1 · Applicant: WISCONSIN ALUMNI RESEARCH FOUNDATION

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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 December 29, 2004 and granted November 21, 2018. A European patent lasts at most 20 years from filing, so its term ended December 29, 2024.
  • 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.
FiledDecember 29, 2004
PublishedSeptember 27, 2006
GrantedNovember 21, 2018
Term endedDecember 29, 2024
Application numberEP 04815646
Classification (CPC)H01S5/34313 +2 more

Timeline

Timeline From EPO dates

2005200720092011201320152017201920212023Application filedDec 29, 2004PublishedSep 27, 2006Patent grantedNov 21, 2018Term endedDec 29, 2024

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.