Composite box structure for a railway car
CA 2261384 A1 · Owner: Thoman, Mell R. · Inventors: Thoman, Mell R.; Coulborn, John W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composite box structure having a core encapsulated in multiple layers of fiber reinforced plastic is provided. The core iaay be formed from various materials which provide improved resistance zo heat transfer betweea the interior and the exterior of the composite box structure. The composite box structure includes a pair of end walls a, pair of side walls, a floor and a roof with fiber reinforced plastic interior and exterior surfaces. An opening is formed in each side wall to allow access to the interior of the composite box structure. A flexible hinge or joint may be integrally molded between each end wall and the respective side walls and between each end wall and the floor. The …
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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 8, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 8, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 8, 2021.
- 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.