Lignin in wood composites
CA 2133740 A1 · Owner: Creamer, Albert W. · Inventors: Rawus, Joseph D.; Senyo, William C.; Lora, Jairo H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel adhesives for wood composites are described. The adhesives comprise a novel combination of an organosolv lignin and a phenol-formaldehyde resin in a weight ratio of from about 0.5:99.5 to about 70:30 based on phenolic solids in said phenol-formaldehyde resin. The adhesives further comprise a modifier which improves the performance of the adhesive. Adhesives comprising an organosolv lignin and a liquid phenol-formaldehyde resin are also described. The organosolv lignin solution is comprised in either an alkaline solution or in a dispersion. Adhesives wherein the organosolv lignin is phenolated or methylolated prior to incorporation with the phenol-formaldehyde resin are also …
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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 April 9, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 9, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2015.
- 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.