Dosage forms comprising polymers comprising different molecular weights
CA 2101245 C · Owner: Barclay, Brian L. · Inventors: Barclay, Brian L.; Swanson, David R.; Wright, Jeri Dawn
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dosage form (10)is disclosed comprising a wall (12) surrounding a compartment (IS), which comprises a first composition (16) comprising a carboxymethylcellulose (17) and a second composition (20) comprising a higher molecular weight carboxymethylcellulose (21).The first composition comprises a dosage amount of drug (16) that delivers from the dosage form (10) at a controlled rate over 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
- Filed April 22, 1992 and granted June 25, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 22, 2014.
- 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.