Rail track surface structure
CA 2203044 A1 · Owner: Martin, John K. · Inventors: Martin, John K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Rail track insert assembly for use between rails and adjacent road surfaces in a road-level rail bed comprising a first resiliently flexible elongate insert member contoured to and sealingly engaging with each of the rail-side and guage-side of each of the rails and a second rigid panel member sealingly engaging with each of the first rail insert members at a planar generally vertical or moderately canted slip plane at their interface, to accomodate vertical movement of the rail in response to the passage of rail car wheels while sealing against intrusion of surface water and detritus. An elongated channel defined in the under surface of each of the insert members accomodates rail clips …
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 April 18, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 18, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 18, 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.