Railroad frog
CA 1289530 C · Owner: Vae Nortrak North America Inc. · Inventors: Barlow, Keith Marvin; Stanley, Thomas Richard; Tuningley, Allen James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A railroad FROG casting has a main casting portion having a top area of triangular shape and a heel extension at one end of the main casting portion, the top area widening towards the heel portion. Flangeways adjacent opposite sides of the top area converge towards a throat which extends, towards a toe. Solid sections spaced apart along the casting each comprise a solid mass of metal extending to opposite side surfaces of the casting and from top to bottom of the casting and downwardly open recesses are spaced apart along the casting and formed in the underside of the casting between successive ones of the solid sections with, supporting structures integral with the solid sections bridging …
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
- Granted September 24, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 24, 2008.
- 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.