Polyurethanes of organic polyisocyanates and polyols derived from alkylene diamines and novolac resins and method of making the same

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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

• Granted December 26, 1967. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 26, 1984.
• We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.