Process for purifying methyl methacrylate
CA 1332744 C · Owner: Yoshioka, Teruhiko · Inventors: Yoshioka, Teruhiko; Kobayashi, Masao; Okamura, Kouhei
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for purifying methyl methacrylate which comprises treating methyl methacrylate having a purity of 99.5% or more containing a trace of impurities with one or more sulfonic acid group-containing compounds. According to the present invention there can be obtained, highly purified methyl methacrylate which exhibits an absorbance of 0.02 or less in a range of wavelength of 400 - 500 nm according to the sulfuric acid color method and is free of even a trace of furan-type compounds.
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 25, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 25, 2011.
- 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.