A highly purified biogenic silica product
CA 2224491 C · Owner: Smith, Timothy R. · Inventors: Wang, Qun; Palm, Scott K.; Shiuh, Jerome C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to highly purified biogenic silica product obtained from diatomite and methods for preparing same. More particularly this , invention pertains to highly purified non-calcined calcined, and flux-, calcined diatomite products which bear the distinguishing porous and intricate structure of silica unique to diatomite and which have an extraordinarily high silica (i.e. silicon dioxide, SiO2) content and low density resulting in , high silica specific volume. These products often also exhibit exceptionally low soluble metals content and/or extreme brightness.
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 12, 1996 and granted November 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 12, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 12, 2018.
- 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.