Buffered matrix aspirin tablet
CA 2067975 C · Owner: Miles Inc. · Inventors: Peck, Garnet E.; Blase, Cynthia M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A buffered aspirin tablet composed of a uniform mixture of aqueous-based polymer coated aspirin a, buffering system and a hydrophillic gel-forming matrix material. The buffering system and matrix material provide a microenvironment on in vitro dissolution of about pH 5. The tablet does not require the use of multilayers and may be prepared by direct compression with conventional equipment.
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 May 4, 1992 and granted January 14, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 4, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 4, 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.