Chemical process for obtaining high purification of monoalkylarsines and dialkylarsines and purified mono- and dialkylarsines
CA 2005343 A1 · Owner: Cvd Incorporated · Inventors: Lorberth, Jorg; Hui, Benjamin C.; Kanjolia, Ravindra K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is provided for highly pure mono- and dialkylarsines, particularly removing substantially all silicon-containing impurities. A mono- or dialkylarsine is reacted with either an alkali metal or an alkali metal hydrocarbyl, thereby producing an alkali metal alkylarsenide. Silicon-containing germanium-containing, zinc-, containing and other metal-containing impurities are removed from the alkali metal alkylarsenide. Monoand dialkylarsine is then regenerated by reaction of the alkali metal alkylarsenide with a proton donor.
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 December 13, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 13, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 13, 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.