Sustained release suppositories and a process for preparation
CA 2099557 A1 · Owner: Frijlink, Hendrik Willem · Inventors: Moolenaar, Frits; Jauw, Tjoe Hang; Frijlink, Hendrik Willem
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sustained release suppository comprising in a usual suppository base, a) a water-soluble therapeutically active substance, the average particle size of which is smaller than 20 µm, b) a physiologically acceptable organic substance which is swellable in contact with water and, c) hydrophobic silicium dioxide. The suppository base is usually a fat having a melting range of from 29 to 38°C. As ingredient b) cellulose derivatives such as hydroxypropylmethylcellulose may be used, in a quantity of from 5 to 40% by weight preferably, 9 to 15% by weight. Ingredient c) is preferably used in a quantity of from 3 to 6% by weight. Also a process for manufacturing the suppositories is described.
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
- Filed July 2, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 2, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 2, 2015.
- 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.