Composition, manufacturing, and use of silicon nitride as a biomaterial for medical purpose
CA 2324291 A1 · Owner: Lindgren, Urban · Inventors: Jianguo, Li; Lindgren, Urban; Olsson, Kent
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention refers to the composition manufacturing and usage of silicon , nitride as a biomaterial for medical usage as a surface carrying orthopaedic , biomaterial for wearing surfaces in artificial joints for example the hip and , the knee joint. The manufacturing is performed by preparing and mixing a mixture of powder containing 70-100 volume % silicon nitride with the addition of 0-30 volume % of one or a combination of the following materials: zirconium dioxide, yttrium dioxide, titanium dioxide calcium oxide, silicon carbide and , mullite. From the mixture a body is formed which is subjected to a high pressure greater than 50 MPa and temperatures between 500-3000 ~C under …
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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 19, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 19, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 2021.
- 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.