Ball bearing
CA 2107188 C · Owner: Tatsuno, Katashi · Inventors: Tatsuno, Katashi; Obara, Rikuro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Balls 3 provided between an outer and an inner ring 1 and 2 are made of high carbon chromium bearing steel. Depending on actual operating conditions at least one of, the outer and inner rings that require corrosion resistance and stable bonding strength is made of martensitic stainless steel with a hardness of HRC 58 or above and an eutectic carbide diameter of 10 µ m or below, thus improving the quietness and rust prevention property.
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 September 28, 1993 and granted November 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2015.
- 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.