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Expired European patentEurope

Dark-room lamp

EP 0047418 B1 · Applicant: Viptronic GmbH

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Overview

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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 21, 1981 and granted February 20, 1985. A European patent lasts at most 20 years from filing, so its term ended August 21, 2001.
  • 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 February 21, 2007.
  • 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 21, 1981
PublishedMarch 17, 1982
GrantedFebruary 20, 1985
Term endedAugust 21, 2001
Application numberEP 81106523
Classification (CPC)G03D17/00

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedAug 21, 1981PublishedMarch 17, 1982Patent grantedFeb 20, 1985Term endedAug 21, 2001

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.