Foamed core composite plate for use in trailer walls and doors
CA 2301651 A1 · Owner: Lewallen, Wilfred E. · Inventors: Ehrlich, Donald J.; Ehrlich, Rodney P.; Lewallen, Wilfred E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel composite plate (20) is used to form a wall (28 30) or a door (32) of , a vehicle, such as a trailer (22) or van. Each composite plate (20) used in the trailer (22) is formed from a pair of metal skins (40 42), such as , aluminum or steel, having a foamed thermal plastic core member (44) sandwiched therebetween. The skins (40, 42) are bonded to the core member (44) by a known flexible adhesive (46). The foamed thermal plastic core member (44) is resilient and may be made from foamed high density or foamed low density thermal plastic. The foaming of the core member (44) in the present invention reduces the weight of the composite plate (20) versus prior art solid plastic core …
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 August 26, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 26, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 26, 2020.
- 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.