Integral skin polyurethane foam and process for production thereof
CA 2198048 C · Owner: Bayko, William M. · Inventors: Bayko, William M.; Kuczynski, Edward T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyurethane foam essentially free of organic carbon-based blowing agent the, polyurethane foam comprising a foam core having a density of from about 5 to about 45 pounds per cubic foot and an integral skin consisting of substantially non-cellular non-porous polyurethane. The presence of the integral skin is characterized by a compression force deflection index of at least about 1.20 the compression force deflection index being defined as the ratio of (i) the compression force deflection orthogonal to a cross-section of the foam to (ii) the compression force deflection of the foam core the compression, force deflection measured according to ASTM 3574C. In a preferred embodiment the, …
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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 February 20, 1997 and granted July 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 20, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 20, 2019.
- 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.