Method of heat treating metal
CA 1190457 A · Owner: Halliburton Company · Inventors: Mcnealy, Richard C.; Cravens, Charles F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The disclosure describes a method of achieving a hardness of no more than 23 on the Rockwell "C" hardness scale in the heat-affected zone in base metal surrounding a weld. The method includes the steps of preheating the base metal prior to welding; maintaining a sufficient interpass temperature to retard the cooling rate of the weld area to a sufficient degree; welding while maintaining the interpass temperature; cooling the weld and base metal below Ms; first postheating the weld and base metal; cooling the weld and base metal; and second postheating by local application of induction heating to the weld and adjacent base metal at a subcritical temperature of at least substantially 1310°F …
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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 July 16, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 16, 2002.
- 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.