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Expired European patentEurope

Autofocusing device and projection exposure apparatus with the same

EP 0474445 B1 · Applicant: CANON KABUSHIKI KAISHA

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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 August 30, 1991 and granted December 16, 1998. A European patent lasts at most 20 years from filing, so its term ended August 30, 2011.
  • 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 March 2, 2017.
  • 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.
FiledAugust 30, 1991
PublishedMarch 11, 1992
GrantedDecember 16, 1998
Term endedAugust 30, 2011
Application numberEP 91307989
Classification (CPC)G03F9/7026

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedAug 30, 1991PublishedMarch 11, 1992Patent grantedDec 16, 1998Term endedAug 30, 2011

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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