Oil-based ink composition for ballpoint pen using oil-based ink
CA 2499646 C · Owner: Ichikawa, Shuji · Inventors: Ichikawa, Shuji; Shoji, Miyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An oil-based ink composition for a ballpoint pen which comprises a colorant, a resin and a solvent selected from among an alcohol having a vapor pressure at 25°°C of 0.001 mmHg or higher a, polyhydric alcohol and a glycol ether as a main solvent accounting for 50 % or more of the total solvent and satisfies , at least one of the following (a) to (C): (a) further comprises a neutralized product of a phosphate ester and polypropylene glycol; (b) further comprises a chemical substance represented by the following formula (1) or (2): (1) wherein R represents an alkyl group having 10 to 30 carbon atoms or (2) wherein R , represents an alkyl group having 10 to 30 carbon atoms; and (c) …
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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
- Filed September 19, 2003 and granted December 11, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 19, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 19, 2025.
- 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.