opposition proceedings
C1CEFR level
62/100Rarity: rare
TechnicalRegister
A procedure allowing third parties to challenge a patent or trade mark at the relevant office after or before grant.
A competitor filed opposition proceedings against our client's European patent.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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