Pulverulent products composed of a water-insoluble core substance and of a protective covering
CA 2070706 C · Owner: Basf Aktiengesellschaft · Inventors: Schwarz, Gerhard; Schneider, Joachim U.; Grafen, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Pulverulent products composed, of a water-insoluble core substance and of a protective covering, are obtainable by, - dispersing the core substance in an aqueous solution of amylose or a starch with an amylose content of more than 40 % by weight as film-forming polymer for the protective covering, - spraying this dispersion using hydrophobic silica as auxiliary and, - subsequently drying the sprayed particles.
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 June 8, 1992 and granted November 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 8, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 8, 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.