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Expired European patentEurope

Rotor redundant force retention system for vtol and vstol aircraft

EP 0448685 B1 · Applicant: Bell Helicopter Textron Inc.

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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 October 10, 1990 and granted May 17, 1995. A European patent lasts at most 20 years from filing, so its term ended October 10, 2010.
  • 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 April 10, 2016.
  • 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.
FiledOctober 10, 1990
PublishedOctober 2, 1991
GrantedMay 17, 1995
Term endedOctober 10, 2010
Application numberEP 90915573
Classification (CPC)B64C27/33 +1 more

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedOct 10, 1990PublishedOct 2, 1991Patent grantedMay 17, 1995Term endedOct 10, 2010

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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