Expired Canadian patentCanada
Process for the synthesis of 3-chloro-4-hydroxyacetanilide
CA 1304407 C · Owner: Fruchey, Olan S. · Inventors: Fruchey, Olan S.
Overview
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel process for the preparation of 3-chloro-4hydroxyacetanilide in high yields is disclosed which involves reacting N-acetyl-para-aminophenol (APAP) with sulfuryl chloride (SO2C12) as the chlorine source and liquid SO2 as the reaction medium.
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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 June 30, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 30, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 1, 1989
GrantedJune 30, 1992
Term endedJune 30, 2009
Patent numberCA 1304407 C
Classification (IPC)C07C233/25 +1 more
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.