Pre-stressed built-up insulated construction panel
CA 2198310 C · Owner: Johnston, David · Inventors: Johnston, David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A construction panel is formed of a plurality of elongate subpanels where each subpanel comprises a plurality of expanded polystyrene blocks placed end to end. Tensioning, cables pass over the inner and outer surfaces of the subpanels between tensioning plates, positioned at each end of the subpanels. Tensioning the cables imparts longitudinal compression, in the subpanels such that the blocks of the subpanels act monolithically. The inner and outer, surfaces of the subpanels are longitudinally convex. The panel may be corrugated. The, subpanels may be interlocking to form the construction panel.
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 24, 1997 and granted October 30, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 24, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 2019.
- 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.