Attenuating pad for concrete railway ties
CA 2031649 A1 · Owner: Igwemezie, Jude O. · Inventors: Igwemezie, Jude O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A railway tie pad is provided with studs that are either offset from opposed positions from each other on, opposite sides of the pad; or are of differing heights. Pads with these features are capable of being more efficient in isolating ties and rails from shock loading and in, accommodating varying loads with differing cushioning characteristics.
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 December 6, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 6, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 6, 2012.
- 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.