Glass vessel crusher
CA 2083315 C · Owner: Ueda, Sadao · Inventors: Ueda, Sadao; Shinpo, Toshio; Kitao, Shuji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A glass vessel crusher including an external cylinder and an internal cylinder disposed in the external cylinder a, glass-vessel crushing space of ring shape in section being defined by the inner wall of the external cylinder and the outer wall of the internal cylinder. At least one of the external cylinder and the internal cylinder is freely rotatable and is so designed that the glass-vessel crushing space becomes gradually narrower along a direction from a glass-vessel throw-in side toward a fragment discharge side and at least one of the inner wall of the external cylinder and the outer wall of the internal cylinder is provided with a projection extending into the ring-shaped …
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 November 19, 1992 and granted February 17, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 19, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 19, 2014.
- 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.