Perforated plastic foam and process for making
CA 2105870 C · Owner: Kolosowski, Paul A. · Inventors: Kolosowski, Paul A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a closed-cell plastic foam structure comprising a plastic foam (10) defining a multiplicity of channels (30) extending from the surface of the foam into the foam. The channels are free of direction with respect to the longitudinal extension of the foam and preferably extend perpendicularly to the longitudinal extension to the foam structure. The channels are in gaseous communication with the environment outside of the foam structure and , provide enhanced release of blowing agent. Further disclosed is a process for making a plastic foam structure comprising (a) providing the plastic foam and (b) perforating the foam at its surface to form a multiplicity of channels …
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 March 24, 1992 and granted September 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 24, 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.