Inhibition of mercaptan odor in organothiophosphate biocides
CA 2007189 C · Owner: Chen, Chia-Chung · Inventors: Chen, Chia-Chung; Rider, Richard H.; Lo, Ray J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mercaptan odors in a thiophosphate compound or formulation are suppressed by treatment of the compound during preparation of the formulation with treatment agents selected from iodine, and alkali and alkaline earth metal hydroxides, hypochlorites and iodates. Depending on the particular agent and method of treatment used the agent and, any reaction products resulting from the treatment may be either removed from the thiophosphate or retained with it in the final formulation. Formulations of particular interest are granular formulations for field application.
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 January 4, 1990 and granted April 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 4, 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.