Method for inhibiting the polymerization of acid monomers
CA 1339145 C · Owner: Mallinckrodt, Inc. · Inventors: Varwig, John W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A new and improved polymerization inhibitor composition, its method of manufacture and its use in, stabilizing acrylic acid. The pre-ogygen-activation of N-nitrosophenylhydroxylamine in combination with hydroquinone monomethyl ether leads to a synergistic performance of these components in the vapor and/or liquid phase, particularly during distillation.
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 July 29, 1997. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 29, 2014.
- 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.