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Expired European patentEurope

Method and device for frequency conversion, especially for doubling the frequency of fixed-frequency lasers

EP 1075671 B1 · Applicant: Spectra-Physics GmbH

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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 20, 1999 and granted June 30, 2004. A European patent lasts at most 20 years from filing, so its term ended April 20, 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 20, 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 20, 1999
PublishedFebruary 14, 2001
GrantedJune 30, 2004
Term endedApril 20, 2019
Application numberEP 99920717
Classification (CPC)G02F1/37

Timeline

Timeline From EPO dates

2000200220042006200820102012201420162018Application filedApril 20, 1999PublishedFeb 14, 2001Patent grantedJune 30, 2004Term endedApril 20, 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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