Expired Canadian patentCanada
Method of removing chlorodibenzo-p-dioxins from polychlorophenols
CA 1101892 A · Owner: Hatcher, David B. · Inventors: Hatcher, David B.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, An aqueous solution of a water-soluble alkaline salt of a polychlorophenol is prepared and then mixed with cyclohexane to extract the dioxins therefrom and the, purified aqueous solution is decanted from the cyclohexane phase.
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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
- Granted May 26, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 18, 1979
GrantedMay 26, 1981
Term endedMay 26, 1998
Patent numberCA 1101892 A
Classification (IPC)C07C39/26
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.