Tongue and groove profile
CA 2036029 C · Owner: Council Of Forest Industries Of British Columbia · Inventors: Parasin, Alexander V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tongue and groove construction panel in which the tongue comprises a protruding extension formed on a first edge of the panel. The tongue has a head with chamfered sides that expand from a narrowed tip to a neck having essentially parallel sides. The neck merges into a shoulder portion having chamfered sides that expand to merge with the panel. The groove comprises a correspondingly shaped cavity formed on a second edge. The groove has a head with chamfered sides that expand from a base to a neck having parallel sides that merge into a shoulder portion having chamfered sides that expand to a groove opening. The tongue and groove have adjacent chamfered head and shoulder surfaces in an …
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 February 8, 1991 and granted June 21, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 8, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 8, 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.
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.