Ethanol-based ink for marking pens
CA 2115074 C · Owner: Suzuki, Nobuo · Inventors: Hattori, Yoshikazu; Kobayashi, Kiyohiko; Morikubo, Satoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides an ethanol-based ink for marking pens which comprises at least one dye selected from the group consisting of compounds represented by specific structures, an ethanol-soluble resin, and ethanol. According to the present invention yellow, orange, red, blue, pink, sky-blue and black inks can be provided and even if these inks are allowed to stand for a long period of time, any precipitates are not observed in the inks and so they are excellent in water resistance after writing. In addition, the fixing properties of the inks to a metal are also good.
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 June 18, 1993 and granted December 16, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 18, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 18, 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.