Vacuum carburizing method and device, and carburized products
CA 2215897 C · Owner: Jh Corporation · Inventors: Kubota, Ken
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of carburizing works by vacuum-heating a work in a heating chamber of a vacuum carburizing furnace, supplying acetylene gas from a carburizing gas source to the heating chamber, and keeping the inside of the heating chamber in a vacuum of 1kPa or below by means of an evacuation source. It is thus possible to carburize uniformly every parts of the work including inner walls of deep recesses thereof while preventing soot generation and to save the quantity of use of gas and heat.
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 March 28, 1996 and granted January 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 28, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 2018.
- 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.