Jointing of building panels and sheets
CA 2053301 A1 · Owner: Duncanson, Robert John · Inventors: Duncanson, Robert John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved panel jointing system wherein panels (10 11) are, provided with profiled edge portions comprising tongue formations (12) and recesses (13) which are of complementary shape to the tongues (12), the tongues (12) of one panel being receivable in the recesses (13) of another panel, wherein the profiled edge portions comprise integrally formed projections (15 16) projecting from , the edge surfaces of the tongues (12) and/or from the walls forming the recesses (13), the tongues (12) recesses (13) and, projections (15, 16) being shaped and dimensioned so that when the, tongues are received in the recesses the tongues (12) form a, friction fit with the recesses (13) and the opposed …
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 May 2, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 2, 2012.
- 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.