System for continuously replenishing melt
CA 2015950 C · Owner: Freedman, Gary M. · Inventors: Willis, John G.; Perletz, Lawrence L.; Freedman, Gary M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system for continuously supplying solid silicon particles to an apparatus for growing hollow, tubular crystalline bodies. The system includes a container for storing solid silicon particles a vibratory, pneumatic, or other device for causing the particles to exit the container through an aperture in the bottom thereof, a receiving chamber coupled with the container for receiving the particles which are dispensed from the container and means for providing a jet of, pressurized fluid in the receiving chamber. The latter is coupled with the crucible of the crystal growth apparatus via a conduit extending up through the center of the crucible. In operation, silicon particles are dispensed …
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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 May 2, 1990 and granted December 6, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 2, 2012.
- 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.