Pyrogenic oxides and a process for their preparation
CA 2227709 A1 · Owner: Degussa-Huls Aktiengesellschaft · Inventors: Mangold, Helmut; Plambeck-Fischer, Peer; Pauli, Ingo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Pyrogenic oxides having a BET surface area of between 30 and 150 m2/g have a viscosity of less than 2,500 mPas in an aqueous suspension. They are prepared by setting the hydrogen ratio gamma and the oxygen ratio lambda to less than one in high-temperature flame hydrolysis. The pyrogenic oxides are employed in the CMP application in the electronics industry.
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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 22, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 22, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 2020.
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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.