Expired Canadian patentCanada
Railroad frog
CA 2085285 C · Owner: Meridian Rail Information Systems Corp. · Inventors: Kuhn, Stephen R.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
railbound manganese frog assembly, having ramps and grooves adapted to receive the false flange formed on, the rim of a worn railroad car wheel to prevent the flange from impacting, components of the frog assembly.
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 14, 1992 and granted June 24, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 14, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 14, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 14, 1992
GrantedJune 24, 2003
Term endedDecember 14, 2012
Patent numberCA 2085285 C
Classification (IPC)E01B7/10
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.