Controlled release dosage forms having a defined water content
CA 1323834 C · Owner: Neale, Philip John · Inventors: Malkowska, Sandra Therese Antoinette; Heafield, Joanne; Leslie, Stewart Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A controlled release, solid, oral dosage form containing a 3-alkylxanthine, preferably theophylline at least one, hydrophilic or hydrophobic polymer at least one wax having a, melting point between 25° and 90°C and between 3% and 10% (by weight) water. Preferably the dosage form is a tablet and the water content is between 9% and 9% (by weight). The amount of water present in the dosage form determines the rate of release of the 3-alkylxanthine.
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 November 2, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 2, 2010.
- 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.