Process for depolymerization of acrylic acid polymers
CA 1162827 A · Owner: The Dow Chemical Company · Inventors: Lewis, Bennie J.; Haschke, Elliot M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for removing acrylic acid polymer from processing vessels, e.g. distillation towers which, comprises contacting said polymer with a dialkyl phthalate having 1 to 4 carbon atoms in each of the alkyl groups in vapor or liquid form at elevated temperatures. This procedure dissolves and depolymerizes the polymer and removes it from the vessel.
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 February 28, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 28, 2001.
- 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.