Rail thermal treatment process
CA 2116216 C · Owner: Pointner, Peter · Inventors: Pointner, Peter; Prskawetz, Georg; Moser, Alfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the thermal treatment of rails in particular, of the rail head, in which cooling is carried out in a cooling agent that contains a synthetic cooling agent additive, and starting at temperatures above 720°C. The treatment is carried out by immersion in the cooling agent until withdrawal of the immersed areas occurs at a surface, temperature between 450 and 550°C which results without temperature equalization across the entire cross-section thereby avoiding hardening of the rail web whilst maintaining an optimal cooling rate for the rail head.
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 July 9, 1993 and granted September 18, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 9, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 9, 2015.
- 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.