Expired European patentEurope
A method of producing chalcogenopentalene compounds, electrophotographic compositions and elements containing these compounds, and novel tellurapentalene compounds
EP 0124974 B1 · Applicant: EASTMAN KODAK COMPANY (a New Jersey corporation)
Overview
The published document from the EPO: abstract, claims, description and drawings. Open it full size
Read the whole patent
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.
Why it's free to use
- Filed March 14, 1984 and granted August 9, 1989. A European patent lasts at most 20 years from filing, so its term ended March 14, 2004.
- 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 September 14, 2009.
- 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.
FiledMarch 14, 1984
PublishedNovember 14, 1984
GrantedAugust 9, 1989
Term endedMarch 14, 2004
Application numberEP 84301712
Classification (CPC)G03G5/067 +2 more
Timeline
Timeline From EPO dates
Sources & verification
Official EPO records
Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.