Roof structures
CA 1306336 C · Owner: Lea, Sandra · Inventors: Lea, Sandra
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A stressed skin panel comprising a pair of elongate planar plywood sheets which are spaced apart with a uniform distance therebetween, by means of longitudinally extending, internal joists. Attached to the inner surface of one sheet is a body of heat insulation material, the thickness of which is such that a continuous ventilation passage is defined between the heat insulation material and the inner surface of the other plywood sheet. Both of the two plywood sheets are cut back at both ends to expose the internal joists, the extent of cut-back being less in the case of the second sheet than the first sheet so that the second sheet overhangs the first sheet at both ends of the panel. In use, …
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
- Granted August 18, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 18, 2009.
- 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.