Coloring paper
CA 1294955 C · Owner: Degen, Hans-Juergen · Inventors: Degen, Hans-Juergen; Ruske, Manfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Paper is colored by a process in which a compound which, in the form of the free acid, is of the general formula I, I, where in each case independently of one another the, radicals, A are each unsubstituted or substituted C1-C6-alkylene or vinylene, the radicals, R are each hydrogen or C1-C4-alkyl the radicals, X are each -CO- or -SO2and the radicals, K are each a cationic group and Y is hydrogen, chlorine or bromine, are used. The novel process gives colorations possessing good fastness properties on paper stocks.
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 28, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 28, 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.