Three layer shot sleeve assembly and method of fabrication
CA 2002132 C · Owner: Zecman, Kenneth P. · Inventors: Zecman, Kenneth P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A three-layer shot sleeve assembly for transferring molten metals to a die and method of making same. A copper layer is welded onto a steel inner barrel leaving a region at each end of the inner sleeve uncoppered. A high yield strength outer shell is shrink fitted onto the coppered inner barrel. The two steel layers are welded together at the two ends. The steel outer shell is more massive and stronger than the inner barrel and serves to hold the inner barrel straight until excessive heat build up in the region opposite the well area is dissipated by the copper layer and transferred to the outer 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 November 2, 1989 and granted October 22, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 2, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 2, 2011.
- 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.