Process for the thermal treatment of metal workpieces in a vacuum
CA 1308631 C · Owner: Heilmann, Paul · Inventors: Schuster, Rolf; Heilmann, Paul; Preisser, Friedrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
During the thermal treatment of metallic work pieces in a vacuum oven using gas quenching, one achieves quenching intensities comparable to those achieved in an oil bath if one uses helium hydrogen, mixtures of these, or mixtures of helium and/or hydrogen with up to 30%-volume inert gas are used as a cooling gas, and the pressure "p" in the oven is adjusted to a value between 1 and 4 MPa and adjusts a value between 10 and 250 m Mpa sec-1 for the gas circulation velocity "v" relative to, the product of p ? v.
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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 October 13, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 13, 2009.
- 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.