Vertical pulverizer
CA 2092481 C · Owner: Nitta, Sachihito · Inventors: Nitta, Sachihito
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vertical medium-stirring type pulverizer has a wear-preventive structure for preventing wear of its screw blade. It is in the form of a plurality of magnets provided on the top surface of the screw blade. At least one of the pulverizing medium and the material to be pulverized which are contained in the pulverizing shell of the pulverizer is a magnetic material. The magnets serve to attract the magnetic medium or material thereto to form a self-lining layer on the top surface of the screw blade. Similar wear-preventive structure may be provided on the inner surface of the shell to prevent wear of the inner surface of the shell.
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 25, 1993 and granted December 8, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 25, 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.