Applications of alkanepolycarboxylic acid derivatives as crosslinking agents for cellulose, new derivatives and textile finishes

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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 October 28, 1991 and granted June 13, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 28, 2011.
• A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 2013.
• We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.