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Expired European patentEurope

Well screen having a uniform outer diameter

EP 0659975 B1 · Applicant: NAGAOKA INTERNATIONAL CORPORATION

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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 November 30, 1994 and granted May 30, 2001. A European patent lasts at most 20 years from filing, so its term ended November 30, 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 May 30, 2020.
  • 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.
FiledNovember 30, 1994
PublishedJune 28, 1995
GrantedMay 30, 2001
Term endedNovember 30, 2014
Application numberEP 94118818
Classification (CPC)E21B43/088

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedNov 30, 1994PublishedJune 28, 1995Patent grantedMay 30, 2001Term endedNov 30, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.