Expired Canadian patentCanada
Silicon nitride bearing ball having high fatigue life
CA 2185131 C · Owner: Saint-Gobain Ceramics & Plastics, Inc. · Inventors: Yeckley, Russell L.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bearing ball consisting essentially of: (a) at least about 94 w/o of a crystalline phase of silicon nitride and (b) a single grain, boundary phase consisting essentially of Mg Al, Si and O.
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 17, 1995 and granted March 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 17, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 17, 2017.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 17, 1995
GrantedMarch 6, 2001
Term endedMarch 17, 2015
Patent numberCA 2185131 C
Classification (IPC)C04B35/58 +2 more
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.