Controlled expansion alloy
CA 1280914 C · Owner: Smith, John Scott · Inventors: Smith, Darrell Franklin, Jr.; Smith, John Scott
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Describes heat-treating nickel-iron and nickel-cobalt-iron, alloys of the age-hardenable controlled low expansion type by annealing in the range of 1750°F to 1900°F, cooling to ambient temperature ageing, at about 1300°F to 1500°F, air cooling to about 1100°F ageing at about, 1100°F to about 1250°F for up to 12 hours and cooling to ambient, temperature.
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 March 5, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 5, 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.