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Expired European patentEurope

Method and apparatus for producing diffraction gratings by machine forming in a fast operation cycle

EP 0683404 B1 · Applicant: ENEA ENTE PER LE NUOVE TECNOLOGIE, L'ENERGIA E L'AMBIENTE

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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 8, 1994 and granted November 3, 1999. A European patent lasts at most 20 years from filing, so its term ended April 8, 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 October 8, 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.
FiledApril 8, 1994
PublishedNovember 22, 1995
GrantedNovember 3, 1999
Term endedApril 8, 2014
Application numberEP 94830166
Classification (CPC)G02B5/1852

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedApril 8, 1994PublishedNov 22, 1995Patent grantedNov 3, 1999Term endedApril 8, 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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