Use of n-alkyl-lactams as crystallization inhibitors
CA 2013729 C · Owner: Horstmann, Heinz-Otto · Inventors: Horstmann, Heinz-Otto; Engelhardt, Ulrich; Reizlein, Karl
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
N-alkyl-ketones of the formula, (see above formula) in which, R represents alkyl having 8 to 18 carbon atoms and n represents the numbers 3, 4 or 5, can be used during application of aqueous spray liquors containing, A) 1-(4-chlorophenyl)-4,4-dimethyl-3-(1,2,4-triazol-1yl-methyl)-pentan-3-of of the formula (II) and/or , 1-(4-chlorophenoxy)-3,3-dimethyl-1-(1,2,4-triazol- 1-yl)-butan-2-of of the formula (III), and B) if appropriate one or more other active compounds and additives, for preventing crystallization of the active compounds of the formulae (II) and/or (III).
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
- Filed April 3, 1990 and granted February 29, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 3, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 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.