Preparation of n-acetyl-p-aminophenol
CA 1212696 A · Owner: Monsanto Company · Inventors: Van Ness, John H.; Warner, James B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Production of N-acetyl-p-aminophenol by hydrogenation of p-nitrophenol to p-aminophenol and concurrently acetyjating the p-aminophenol with acetic anhydride with the acetylation controlled so that substantially no excess acetic anhydride is present in the system until the hydrogenation reaction has reached substantial completion.
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
- Granted October 14, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 14, 2003.
- 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.