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Expired European patentEurope

Slip-ring device for electrical machines

EP 0052385 B1 · Applicant: BBC Aktiengesellschaft Brown, Boveri & Cie.

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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 September 29, 1981 and granted June 13, 1984. A European patent lasts at most 20 years from filing, so its term ended September 29, 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 March 29, 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.
FiledSeptember 29, 1981
PublishedMay 26, 1982
GrantedJune 13, 1984
Term endedSeptember 29, 2001
Application numberEP 81201079
Classification (CPC)H02K9/28 +2 more

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedSep 29, 1981PublishedMay 26, 1982Patent grantedJune 13, 1984Term endedSep 29, 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.