Process for producing a finely divided silica by spray drying
CA 1061988 A · Owner: Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler · Inventors: Peters, Albert; Reinhardt, Helmut; Nauroth, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides in a process for producing a finely divided silica by spray drying in a spray drier a sprayable highly concentrated silica suspension which is low, in grit content the improvement in which the spray drying is carried out in the presence of a base or of a basic-reacting substance in an amount sufficient for complete or partial neutralization of the acid present in the suspension originating as acid used as a dispersing agent or of acid still present in redispersed filter cake or for alkaline adjustment to yield a dried silica with a pH value greater than 6Ø
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
- Granted September 11, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 11, 1996.
- 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.