Spheroids
CA 1310584 C · Owner: Neale, Philip John · Inventors: Leslie, Stewart Thomas; Heafield, Joanne; Neale, Philip John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A controlled release pharmaceutical composition contains a number of spheroids, the spheroids containing a water-insoluble drug dispersed in a controlled release matrix. The matrix contains between 70% and 99.5% (by weight) of microcrystalline cellulose, between 0.5% and 4% (by weight) of a cellulose derivative and, optionally up to 26% of a sugar, or a sugar alcohol. The water insoluble drug must dissolve in water (pH 5) at 20°C to a concentration of less than 1.0mg ml-1 preferably less, than 0.5mg ml-1. Preferred drugs are non-steroidal anti-inflammatory agents, especially fenprofen calcium ibuprofen, ketoprofen, naproxen, diclofenac sodium fenbufen, flurbiprofen, indomethacin, …
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 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 24, 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.