Roller shell hard coating
CA 1083897 A · Owner: Ingersoll-Rand Company · Inventors: Banerjee, Bani R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure Invention covers a method of hard surfacing machine parts, specifically the invention discloses a method of impregnating the surface of cylindrical pellet mill roller shells with tungsten carbide particles applied with a tungsten inert gas welding process. In the method of this invention the surface layer of the roller shell is first carbon enriched by surface gas carburizing prior to welding. The resulting surface exhibits good distribution of tungsten carbide particles and resistance to surface cracking.
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 August 19, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 19, 1997.
- 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.