Basic rhodamine dyes
CA 1339276 C · Owner: Oberlinner, Andreas · Inventors: Mayer, Udo; Oberlinner, Andreas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Basic rhodamine dyes suitable for use in recording fluids for the ink jet process and for coloring paper stock have the formula where, L is C2-C10-alkylene, R1, R2 and R3 are each independently of the others hydrogen substituted or unsubstituted C1-C10-alkyl or C5-C7-cycloalkyl or R1 and R2 together with the nitrogen atom linking them together are a hetero cyclic radical, An~ is one equivalent of an anion and m and n are each independently of the other 0 or 1.
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
- Granted August 12, 1997. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 12, 2014.
- 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.