Aqueous liquid preparation containing 2-amino-7-alkyl- 5-oxo-5h¬1 benzopyrano-¬2,3-b pyridine-3- carboxylic acid
CA 1269618 C · Owner: Shimizu, Hisayoshi · Inventors: Terayama, Hideo; Shimizu, Hisayoshi; Oshima, Mitsuaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the aqueous liquid preparation of this invention which, comprises a compound of the formula; wherein R is an alkyl having 1-6 carbon atoms and at least, one species of the solubilizers selected from the group consisting of polyvinylpyrrolidone, cyclodextrin and caffeine, the solubility of the compound in water can be heightened and the aqueous liquid prepared thereby can afford a desired stability and mitigate eye-irritation or nose-irritation.
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 May 29, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 29, 2007.
- 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.