Method for providing enteric coatings on solid dosage forms
CA 1050358 A · Owner: Shin-Etsu Chemical Co. · Inventors: Hoshi, Noboru; Ohno, Shigeru; Sekigawa, Fujio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Enteric coatings are provided on solid pharmaceutical dosage forms by a method which includes the step of covering the dosage forms with an aqueous solution in water-soluable salt form of a polymeric substance having carboxyl groups; the water-soluble salt being selected from alkali metal ammonium, or organic amine salts of the polymeric substance. The coating solution includes substantially no organic solvent and this, method is safe from dangers of air pollution and fire or explosion. The coated dosage form then is brought into contact with a gaseous or diluted inorganic acid selected from the group consisting of hydrochloric acid, sulfuric acid and phosphoric acid. The amount of acid is …
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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
- Granted March 13, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 13, 1996.
- 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.