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Expired European patentEurope

A method and an apparatus for expanding magnification range of a photographic projector

EP 0196663 B1 · Applicant: Dainippon Screen Mfg. Co., Ltd.

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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 2, 1986 and granted February 28, 1990. A European patent lasts at most 20 years from filing, so its term ended April 2, 2006.
  • 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 2, 2011.
  • 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 2, 1986
PublishedOctober 8, 1986
GrantedFebruary 28, 1990
Term endedApril 2, 2006
Application numberEP 86104486
Classification (CPC)G03B27/34

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedApril 2, 1986PublishedOct 8, 1986Patent grantedFeb 28, 1990Term endedApril 2, 2006

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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