Expired European patentEurope
Spin-polarized electron source using a multiple microtip emission cathode, use in electron matter or electron particle interaction physics, plasma physics, electron microscopy
EP 0272178 B1 · Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUE
Overview
The published document from the EPO: abstract, claims, description and drawings. Open it full size
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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.
Why it's free to use
- Filed November 24, 1987 and granted September 11, 1991. A European patent lasts at most 20 years from filing, so its term ended November 24, 2007.
- 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 May 24, 2013.
- 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.
FiledNovember 24, 1987
PublishedJune 22, 1988
GrantedSeptember 11, 1991
Term endedNovember 24, 2007
Application numberEP 87402646
Classification (CPC)H01J3/022 +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.