Process for preparing oxymethylene polymers using boron trifluoride in admixture with an inert gas
CA 1292834 C · Owner: Hoechst Celanese Corporation · Inventors: Greene, Richard K.; Boldt, Clifford R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of Disclosure, Oxymethylene polymers are prepared by the continuous polymerization of trioxane using as a catalyst a blend of boron trifluoride gas and nitrogen gas. Oxymethylene polymers are used in the manufacture of plumbing fixtures pipes, automobile body, parts and a variety of other articles.
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 December 3, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 3, 2008.
- 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.