Paper coater skip prevention and deaeration apparatus and method
CA 2115363 C · Owner: Black Clawson Company, Inc. · Inventors: Caryk, Paul John; Taylor, John Andrew
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Deaeration apparatus for removing entrained air from paper coating liquid includes a cylindrical vortex tube (30) with a vortex generator insert (50) formed with a helical flighting (53) surrounding a solid center shaft (55). A reject conduit (42) is positioned at an end of the vortex tube (30) and at the axial center thereof remote from the flighting (53). The deacrated pager coating liquid exits an outlet end opening (46) of the vortex tube (30). The entrained gas forms bubbles on the vortex generator shaft (55). The bubbles form a column extending from the shaft (55) to the reject conduit (42). The deaeration apparatus includes a plurality of vortex tubes (30) arranged in parallel …
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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 August 7, 1992 and granted February 22, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 7, 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
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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.