Process for producing anti-microbial effect with complex silver ions
CA 2136455 C · Owner: Nucryst Pharmaceuticals Corp. · Inventors: Apte, Prasad Shrikrishna; Burrell, Robert Edward; Gill, Kashmir Singh
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Production of an anti-microbial effect in an alcohol or water based electrolyte is achieved by preparing silver materials that form complex ions other than Ag+ Ag2+, or Ag3+, and which produce an anti-microbial effect that is greater than that produced by an equivalent amount of silver as Ag+. Exemplary complex silver ions produced include Ag(CN)2- AgCN(aq)(ion pair), Ag(NH3)2+, AgCl2-, and Ag(S2O3)2 3-. The silver materials must be prepared as powders or as solutions or suspensions containing the complex silver ions.
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 31, 1994 and granted June 29, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 31, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2016.
- 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.