Ink compositions
CA 2105459 C · Owner: Hayakawa Rubber Co. Ltd. · Inventors: Koshio, Shuichi; Yamada, Kosaku; Miya, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A radiation-durable ink composition contains a vehicle mixture comprising: (A) at least one linear polyester oligomer and/or polymer substantially free of an acid group and free of a polymerizable double bond in a molecule wherein 1 to 10 double bonds are pendent from the linear polyester chain, and/or mixture thereof (B) at least one, single double bond-containing carboxylic acid wherein the acid has at least one acid group, and/or carboxylic ester of the said acid, and/or carboxylic amide of the said acid and/or mixture thereof, (C) a double bond-containing polycarboxylic ester, wherein 2 to 10 acid groups are present and at least 2 double bonds are pendent from the ester having 2 to 10 …
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 September 2, 1993 and granted April 21, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 2, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 2, 2015.
- 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.