Ink compositions containing lanthanide complexes
CA 2473180 A1 · Owner: Koller, Stefan · Inventors: Koller, Stefan; Hall-Goulle, Veronique; Mheidle, Mickael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an ink composition containing (a) a compound of formula (I), Lm-Ln 3+(Ch-)n (I), wherein Ln represents a lanthanide CH- is a , negatively charged ligand containing at least one UV absorbing double bond n , denotes 3 or 4, m denotes a number from 1 to 4 in case n is 3, m denotes a , number from 1 to 4 and L is a neutral monodentate or polydentate nitrogenoxygen- or sulfur-containing UV absorbing ligand with the exception of 2,2'bipyridyl or, in case n is 4, m denotes 1 and L is a single-charged cation; and (b) a liquid ink carrier, which can be used for applying hidden mark on objects which can only be revealed under UV exposure.
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 February 18, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 18, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 18, 2025.
- 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.