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Expired European patentEurope

Toners and developers containing ester-containing quaternary pyridinium salts as charge control agents

EP 0548348 B1 · Applicant: EASTMAN KODAK COMPANY

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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 July 16, 1992 and granted March 20, 1996. A European patent lasts at most 20 years from filing, so its term ended July 16, 2012.
  • 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 January 16, 2018.
  • 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.
FiledJuly 16, 1992
PublishedJune 30, 1993
GrantedMarch 20, 1996
Term endedJuly 16, 2012
Application numberEP 92915992
Classification (CPC)G03G9/0975 +1 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedJuly 16, 1992PublishedJune 30, 1993Patent grantedMarch 20, 1996Term endedJuly 16, 2012

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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