Fire retardant structural panel
CA 2038758 A1 · Owner: Georgia-Pacific Corporation · Inventors: Lehnert, Charles W.; Fowler, George F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composite building panel particularly well suited for use as roof sheathing is disclosed. The panel consists of two layers adhesively bonded to each other before assembly with the building structure. The first layer which is preferably, either unfaced gypsum fiberboard or glass-mat-faced gypsum board, comprises set gypsum as the major ingredient. The second layer is wood-like material, such as plywood. The roof sheathing panel may advantageously be used in place of FRT plywood in locations in buildings requiring enhanced fire resistance, particularly in the region immediately on either side of the party wall dividing one dwelling unit from another in a multi-unit building, such as a …
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 March 21, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 21, 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.