High-structure precipitated silicas
CA 2363701 A1 · Owner: Meier, Karl · Inventors: Meier, Karl; Kuhlmann, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to high structure precipitated silicas that have been subjected to a short, retention drying process a process to manufacture these and the use thereof. The precipitated silicas are characterized by the following physico-chemical characteristics:, pH (5% in water) (ISO 787-9) 3 - 8 BET surface area (DIN 66131) m2/g 400 - 600 DBP absorption value (DIN 53601,in relation to g/100g 380 - 420 dried substance), Tapped density (ISO 787-11 ) g/I 100 - 200 ALPINE sieve residue > 63µ (ISO 8130-1) % 0.1 - 40
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 23, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 23, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 23, 2023.
- 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.