Evaluation apparatus for cleanliness of metal and method therefor
CA 2190123 C · Owner: Chiba, Koichi · Inventors: Toh, Takehiko; Umezawa, Kazushige; Uemori, Ryuji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to quickly and economically evaluate cleanliness of a metal with high representativity when quantities, compositions, etc. of non-metallic inclusion particles existing in a metal and resulting in product. defects are evaluated by a sample collected during the production process of the metal, the present invention provides an evaluation method involving the steps of levitation-melting a metal piece for a predetermined time by cold crucible levitation-melting means discharging, non-metallic inclusion particles contained in the metal piece to the surface of a molten metal and directly, analyzing a curved and non-smooth sample surface after solidification by a fluorescent X-ray …
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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
- Filed March 14, 1996 and granted July 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 14, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 14, 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
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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.