Boron-containing precipitated silica
CA 1110406 A · Owner: Degussa Aktiengesellschaft · Inventors: Kuhlmann, Robert; Nauroth, Peter; Turk, Gunter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a boron-containing precipitated silica, characterized by the following physical-chemical characteristic data:, loss on ignition (DIN 55921) % by weight 14-40 pH value (DIN 53200) 4-6, conductivity in a 4% aqueous dispersion µS <800 tamped powder density (DIN 53194) g/litre 130?100 screenings according to Alpine >63 µm % by weight <0.1 SiO2 content (DIN 55921) but relative to to original substance % by weight 9-76 B2O3 content relative to the original, substance % by weight 10-51 Na2O content relative to the original, substance % by weight <0.5 SO3 content relative to the original, substance % by weight <0.8 The boron-containing precipitated silica is inter …
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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
- Granted October 13, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 13, 1998.
- 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.