Hydrostatic shoe for controlled crown roll
CA 2266934 C · Owner: Metso Paper, Inc. · Inventors: Deshpande, Rajendra D.; Alfano, James P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A controlled crown roll utilizes a, crown support piston (76) with a glide shoe (78) with a cavity (80) in the face of the glide shoe centered under the nip loading line. The cavity is surrounded by a land area (83), the majority of which is located away from the nip load. Use of a low viscosity hydraulic fluid, for example, 15.6 cP, with a hydraulic film thickness of 0.002 inches, results in significantly lower friction between the glide shoe and the interior surface (40) of the rotating mantle. Recesses in the piston sides form hydrostatic thrust bearings (82) which perform the centering function for the piston and the glide shoe.
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 July 18, 1997 and granted February 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 18, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 18, 2019.
- 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.