Insecticide
CA 2000960 C · Owner: Vrba, Cenek H. · Inventors: Vrba, Cenek H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Insects are combatted by treating them with a pyrogenically produced, hyrophobized silicic acid. When this is done one, can, on the one hand, spray the insects with an aqueous dispersion of the pyrogenically produced hyrophobized, silicic acid. On the other hand one can dust the insects, with the pyrogenically produced hydrophobized silicic acid, in powder form.
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 October 18, 1989 and granted December 24, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 18, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 18, 2011.
- 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.