A method and apparatus for increasing the hardness and intensity of wood
CA 2262811 C · Owner: An, Sun-Tae · Inventors: An, Sun-Tae
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for increasing the hardness and intensity of wood which comprises chuck means for holding the wood in a fixed position for processing, a compression-shaped forming die for compressing the wood being processed an ultrasonic, wave-generating device operatively connected with the compression-shaped forming die for applying sound waves to the wood, a forming mold positioned downstream of said compression-shaped forming die for receiving wood therefrom, said forming mold further compressing said wood to remove a portion of the water contained therein and, means for advancing the chuck means containing the wood being processed through the compression-shaped forming die the ultrasonic …
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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 March 9, 1999 and granted November 14, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 9, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 9, 2021.
- 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.