Ambient-free processing system
CA 2076334 C · Owner: Praxair Technology, Inc. · Inventors: Brestovansky, Dennis Francis; Nowotarski, Mark Stephen; Plante, Walter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus and method for processing a workpiece in an ambient-free, atmosphere of selected gas. A preparation vessel has an opening for entry of the workpiece and a diffuser oriented to emit across the vessel opening a laminar curtain flow of the selected gas which enters, purges the vessel and prevents the infiltration of air. The workpiece on its carrier is transported into the preparation vessel where air is purged out and replaced with selected gas. A processing vessel has a similar workpiece entry opening and diffuser. The preparation vessel and the processing openings are brought into coincidence, and the carrier is transported into the processing vessel for processing of the …
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 August 18, 1992 and granted March 4, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 18, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 18, 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.