Precipitated silicas having high structures and process for producing same
CA 1194272 A · Owner: Degussa Aktiengesellschaft · Inventors: Esch, Heinz; Turk, Gunter; Nauroth, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Precipitated silicas which are characterized by the following physicochemical characteristic data: BET surface area accord-, ing to DIN 66131 sqm/g 400-600 400-600 400-600 DBP number % 340-380 320-360 310-360, tamped density according to DIN 53194 g/litre 180-220 75-120 35-70 "ALPINE retained on, sieve" >63 µm % by weight 25-60 <0.1 <0.01 Depending on the particle size distribution curve these precipitated silicas can be used as support catalysts for all kinds of active substances, as antiblocking agents for polypropylene and polyethylene sheeting, as thickening silicas in specific polar systems in which pyrogenic silicas show low thickening performance, as highly effective dulling agents …
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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 1, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 1, 2002.
- 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
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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.