Method for the preparation of crystalline and zeolitic aluminosilicates
CA 2018691 C · Owner: Alsi-Penta Zeolithe Gmbh · Inventors: Tissler, Arno; Schmidt, Hubertus; Thome, Roland
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a method of preparing crystalline, zeolitic aluminosilicates with SiO2/Al2O3 ratios of 20 or more. The method provides a rapid two-stage crystallization , process which avoids the formation of secondary crystalline phases. The first stage is conducted at a temperature between 240°C and 325°C for between about 1 and 20 minutes. The second stage is conducted at a temperature between about 120°C and 225°C for about 1 to 100 hours.
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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 June 11, 1990 and granted September 19, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 11, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 2012.
- 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.