Crystalline aluminophosphates and related compounds
CA 2054604 A1 · Owner: Shell Canada Limited · Inventors: Dogterom, Ronald Jan; Kraushaar-Czarnetzki, Bettina; Clark, David Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Crystalline aluminophosphates and related compounds having in the as-synthesised dried form the chemical composition expressed as a R (b P205) (c A1203) (d SiO2) (e MeO) (z H2O) wherein R represents a diamine of the general formula R2R3N-R1-NR4R5, wherein R1 represents a C8-C14 carbon chain which may contain one or more inert substituents and each of R2 R3, R4 and R5 represents, a hydrogen atom or an alkyl group which may contain one or more inert substituents and Me represents a divalent metal moiety wherein:, a:b = 0.5 - 1, (c + e):b = 0.4 - 0.95 d:b = 0 - 0.25, (c + e):a = 0.8 - 1.2 and z:b at least 0.1. The compounds can be prepared from a forming solution or gel comprising a source of …
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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 October 31, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 31, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2013.
- 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.