Stable dispersions of polyhydrazodicarbonamides useful in the preparation of polyurethane products having improved load-bearing capacity
CA 2061592 A1 · Owner: Tirpak, Robin E. · Inventors: Koshute, Mark A.; Tirpak, Robin E.; Radovich, David A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mo-3568, MD-90-89-PU, STABLE DISPERSION OF POLYHYDRAZODICARCONAMIDES USEFUL IN THE PREPARATION OF POLYURETHANE PRODUCTS HAVING IMPROVED LOAD-BEARING CAPACITY, ABSTRACT OF THE DISCLOSURE The present invention is directed to a process for preparing a stable dispersion, the dispersion so-produced and, the process of using such dispersion in the preparation of a polyurethane foam. The dispersion is produced by reacting (a) an organic isocyanate, (b) a compound containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight of from 400 to 10,000, (c) an alkanolamine and (d) a, hydrazine, a hydrazide, or a mixture thereof in the presence, of a tin compound capable of …
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 February 20, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 20, 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.