Low density agglomerate utilizing a carbohydrate binder
CA 2035325 C · Owner: Wise, Kenneth J. · Inventors: Lehman, Richard L.; Wise, Kenneth J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of a low density substantially water-insoluble, particulate material which comprises forming an aqueous slurry containing precipitated calcium carbonate and a carbohydrate binder and treating said slurry to heating and mechanical processing steps to provide a particulate material having a particle size of 5-300 microns, a particle density of no more than 1.0 g/ml. and a resistance against degradation in water; and a low density, substantially water-insoluble calcium, carbonate-containing, particulate material prepared by such process.
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 January 25, 1991 and granted June 10, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 25, 2013.
- 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.