Anisotropic retardation layers for display devices
CA 2299497 A1 · Owner: Minnesota Mining And Manufacturing Company · Inventors: Sahouani, Hassan; Vogel, Kim Marie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition (I) with includes the following compounds: wherein R1 which may , be the same or different, is a hydrophilic group; R2 which may be the same or , different, is selected from the group consisting of electron donating groups electron withdrawing groups, and electron neutral groups; R3 is a substituted or unsubstituted, positively charged heteroaromatic ring linked to the triazine backbone through a nitrogen atom in the R3 ring; and X- is a counterion. If R3 is an unsubstituted pyridine the counterion X- may be , selected from any counterion other than Cl- and OH-. Otherwise the counterion , X- may be selected from any counterion. The compound may be applied to a substrate to …
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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 January 8, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 8, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 8, 2020.
- 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.