Sustained release dosage form
CA 1302255 C · Owner: Teikoku Seiyaku Kabushiki Kaisha · Inventors: Konishi, Ryoji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A drug reservoir containing an active substance such as a drug is formed on an adhesive layer which can adhere to an oral mucosal membrane. A polymer, which does not dissolve with saliva is, further coated on the drug reservoir as a drug release controlling layer to form an entire oral cavity sustained release dosage form. A drug impermeable layer can be formed between the adhesive layer and the drug reservoir.
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 June 2, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 2, 2009.
- 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.