Electrophotographic toners
CA 2004107 A1 · Owner: Bayer Aktiengesellschaft · Inventors: Raue, Roderich; Wunderlich, Klaus; Harnisch, Horst
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Electrophotoqraphic toners, A b s t r a c t The invention relates to positively charged electrophotographic toners which, in addition to customary resin and pigment particles, contain an additive which intensifies the cationic charge, of the general formula, An- (I), wherein, R1 and R2 independently of one another represent H C1-C22-alkyl, allyl, cyclohexyl, phenyl-C1-C2alkyl or phenyl and, An denotes an anion wherein the ring A and the cyclic and acyclic radicals can carry 1-2 nonionic substituents. Le A 26 448-US
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed November 29, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 29, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.