Process for producing single phase magnetite powder
CA 2133642 C · Owner: Mano, Yasuhiko · Inventors: Mochizuki, Takeshi; Mano, Yasuhiko; Sasaki, Isamu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Hematite powder is mixed with a substance having a carbon-to-carbon single or double bond and sintered, in an inert gas to form magnetite powder. The magnetite powder can be provided with a desired electric resistance while retaining the properties characteristic of the magnetite powder by effecting a heating in an oxygenic atmosphere after the formation of the magnetite powder (or during a cooling subsequent to the sintering in the inert gas).
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 31, 1994 and granted July 6, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 31, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 31, 2016.
- 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.