Enteric capsules
CA 1062613 A · Owner: Parke, Davis And Company · Inventors: Okajima, Yakutaro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Application for Letters Patent, on an Invention Entitled: "ENTERIC CAPSULES", Abstract of the Disclosure: Pharmaceutical capsules having enteric properties are formed from a homogeneous composition comprising (1) gelatin or hydroxypropyl methylcellulose and (2) an ammonium salt of either a) cellulose acetate phthalate, b) hydroxypropyl methylcellulose phthalate or c) a copolymer of methacrylic acid and methacrylic acid alkyl ester; optionally with the inclusion of plasticizer and/or coloring agent. The capsules are soluble in or disintegrated by the alkaline intestinal secretions but are substantially insoluble or resistant to solution in the acid secretions of the stomach. - 1 -
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 September 18, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 18, 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.