Controlled release dosage form
CA 1331565 C · Owner: Tanabe Seiyaku Co. Ltd. · Inventors: Samejima, Masayoshi; Kobayashi, Masao; Noda, Kazuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a controlled release dosage form which consists essentially of a core containing a medicament; an inner coating layer composed of ethylcellulose and a hydrophobic substance; and an outer coating layer containing a medicament. Said dosage form shows a rapid increase in concentration of the medicament in the blood and at the same time maintains the high level of the concentration over a prolonged period of time.
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 August 23, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 23, 2011.
- 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.