Supermicrocellular foamed materials
CA 2107355 C · Owner: Baldwin, Daniel F. · Inventors: Baldwin, Daniel F.; Cha, Sung W.; Park, Chul B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A supermicrocellular foamed material and a method for producing such material the material to be foamed such as a, polymerplastic material having a supercritical fluid, such as carbon dioxide in its supercritical state introduced into the material to, form a roamed fluid/material system having a plurality of cells distributed substantially throughout the material. Cell densities lying in a range from about 10 9 to about 10 15 per cubic centimeter of the material can be achieved with the average cell sizes being at least less than 2.0 microns and preferably in a range from about 0.1 micron to about 1.0 micron.
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
- Filed April 3, 1992 and granted July 20, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 3, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 2014.
- 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.