Ceramic microspheres
CA 2003526 A1 · Owner: Smith, Thomad K. · Inventors: Smith, Thomad K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ceramic microspheres are produced by dispersing a bauxite or bauxitic clay material in an aqueous medium spray, drying the dispersion to produce green microspheres and then subjecting the microspheres to calcination and sintering in the temperature range of between 1100°C and 1600°C. The resultant ceramic microsphere product is used as a functional filler in composite materials to modify physical and chemical properties of the composite.
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 November 21, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 21, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 21, 2011.
- 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.