Process for the synthesis of epsilon-caprolactam
CA 1307261 C · Owner: Cellini, Francesco · Inventors: Tancorra, Raffaele; Tonti, Sergio; Cellini, Francesco
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a two-step process for the synthesis of caprolactam by reaction of cyclohexanone-oxime with an excess of oleum, carried out in a first step with only a portion of the oxime and in the presence of liquid S02, according to usual "cold" techniques the amount of free, S03 in the oleum being equal to or greater than 50% by weight wherein said "cold" step is completed by a second "hot" step by adding a second portion of oxime, the ratio between said second portion and said first portion ranging from 0.5 to 1.2.
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 September 8, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 8, 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.
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.