Method of manufacturing a modified polyhydroxy compound
CA 1306470 C · Owner: Tada, Satomi · Inventors: Kumasaka, Sadao; Wakabayashi, Hirokazu; Tada, Satomi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of manufacturing a modified polyhydroxy compound, which is characterized in that a polyhydroxy compound is heated for 30 minutes or more at a temperature ranging from 150 to 250°C under stirring and in the presence of tin, tin compounds such as tin halogenide tin hydroxide and tin oxide. The polyhydroxy compound modified by this method is effective in improving the foamability and mechanical strength of urethane foam when it is used as a raw material in the manufacture of urethane foam.
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 August 18, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 18, 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.