Dyes containing polyhydroxyl groups for ink-jet printing inks
CA 1293971 C · Owner: Hindagolla, Suraj L. · Inventors: Pawlowski, Norman E.; Bares, Steven J.; Hindagolla, Suraj L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dye used in ink compositions for ink jet printing comprises an aromatic dye molecule having attached to the backbone thereof from one to four polyhydroxylsubstituted groups having the formula selected from the group consisting of:, (a) CH2OH-(CHOH)nCH2Owhere n = 2 to 10;, (b) On-1CnH2n-1-Owhere n = 5 to 7; and, (c) C6nH5n+1O5n -Owhere n = 1 to about, 100. These dyes have improved water solubility and improved interaction with paper.
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 January 7, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 7, 2009.
- 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.