Manufacturing method for wood board
CA 2101617 C · Owner: Yamaha Corporation · Inventors: Hirano, Yoshihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Wood fibers obtained by the fiberization of wood are acetylated in a vapor phase acetylating agent acetic anhydride or the like. The acetylated fibers are accumulated, and molded into a solid wood board. By means of the manufacturing method of the present invention it is, possible to obtain wood board which exhibits little moisture absorption and water absorption. Furthermore the, acetylation is conducted in the vapor phase acetylating agent, so that the amount of acetylating agent used is greatly reduced in comparison with the case in which the acetylation is conducted in the liquid phase acetylating agent.
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 July 29, 1993 and granted February 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 29, 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.