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Expired European patentEurope

Context switching method, device, program, recording medium, and central processing unit

EP 1582980 B1 · Applicant: Japan Science and Technology Agency

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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 December 11, 2003 and granted March 21, 2012. A European patent lasts at most 20 years from filing, so its term ended December 11, 2023.
  • Supplementary protection certificates extend only medicine and crop-protection patents, and it isn't classified as either.
  • 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.
FiledDecember 11, 2003
PublishedOctober 5, 2005
GrantedMarch 21, 2012
Term endedDecember 11, 2023
Application numberEP 03780720
Classification (CPC)G06F9/461 +2 more

Timeline

Timeline From EPO dates

2004200620082010201220142016201820202022Application filedDec 11, 2003PublishedOct 5, 2005Patent grantedMarch 21, 2012Term endedDec 11, 2023

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.