Improved vitrified abrasive bodies
CA 2179525 C · Owner: Li, Rounan · Inventors: Li, Rounan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved hot-pressed vitrified bodies are described which comprise an abrasive material, a vitreous bond; and at least one extender agent. The extender agent may be formed of hollow ceramic bodies such as glass or mullite spheres alone or in combination with a, non-reactive material such as graphite. An improved method for preparing vitrified abrasive wheels is also described.
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 January 5, 1995 and granted March 14, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 5, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 5, 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.
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.