Polyurethane polyene compositions
CA 1237222 A · Owner: Tyndale Plains-Hunter, Ltd. · Inventors: Gould, Francis E.; Johnston, Christian W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of the Invention:, POLYURETHANE POLYENE COMPOSITIONS Polyurethane polyene compositions are obtained by reacting from about 10 to about 50 parts by weight of a polyene in the presence of about 100 parts by weight of a hydrophilic polyurethane resin. The resulting products will swell and increase in weight upon immersion in water and are permeable to gases, moisture vapor ions, and other low molecular weight species The hydrophilic polyurethane diacrylate compositions may be molded to form shaped products that are demensionally stable after repeated exposure to boiling water and exhibit memory .
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 May 24, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 24, 2005.
- 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.