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Expired European patentEurope

Multiple pitch escapement and backspace mechanism for a moving paper carriage typewriter

EP 0021099 B1 · Applicant: International Business Machines Corporation

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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 May 29, 1980 and granted May 4, 1983. A European patent lasts at most 20 years from filing, so its term ended May 29, 2000.
  • 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 November 29, 2005.
  • 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.
FiledMay 29, 1980
PublishedJanuary 7, 1981
GrantedMay 4, 1983
Term endedMay 29, 2000
Application numberEP 80102991
Classification (CPC)B41J19/62 +2 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedMay 29, 1980PublishedJan 7, 1981Patent grantedMay 4, 1983Term endedMay 29, 2000

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.