Expired Canadian patentCanada
Process for the preparation of phosphonous acids
CA 1195339 A · Owner: Hoechst Aktiengesellschaft · Inventors: Kleiner, Hans-Jerg; Neumaier, Hubert
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 of the disclosure:, Phosphonous acids are obtained by hydrolysis of dichlorophosphanes with water at temperatures of about 60 to about 100°C, preferably of about 80 to about 95°C,
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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 October 15, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 15, 2002.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 19, 1982
GrantedOctober 15, 1985
Term endedOctober 15, 2002
Patent numberCA 1195339 A
Classification (IPC)C07F9/48
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.