A process for the production of fillers modified with organosilicon compounds, the fillers thus modified and their use
CA 2036488 C · Owner: Degussa Aktiengesellschaft · Inventors: Wolff, Siegfried; Gorl, Udo; Deusser, Hans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the production of fillers modified with organosilicon compounds, the fillers thus modified and their use. The invention relates to a two-step process for the surface modification of natural or synthetic oxidic or silicate fillers using organosilicon compounds corresponding to the following formulae, (see formulae I or II) in which the filler and the compound are intensively mixed in the absence of further solvent and the homogenized mixture is subjected to the hydrophobicizing reaction in the preheated mixer.
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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 February 15, 1991 and granted May 14, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 15, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 15, 2013.
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Timeline
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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.