Expired Canadian patentCanada
Ink comprising c.i. direct black 168 and solvent
CA 1303301 C · Owner: Syngenta Limited · Inventors: Presgrave, John Edward; Greenwood, David
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Dn 34063, ABSTRACT, "Ink comprising C.I. Direct Black 168 and Solvent" An ink for ink-jet printing comprising a solution of C.I. Direct Black 168 which, in its free acid form is of the, formula (I):, (I)
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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
- Granted June 16, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 16, 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.
FiledOctober 2, 1987
GrantedJune 16, 1992
Term endedJune 16, 2009
Patent numberCA 1303301 C
Classification (IPC)C09B35/38
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.