Improved method and apparatus for repairing screens
CA 2393818 C · Owner: Robertson, Graham · Inventors: Robertson, Graham; Hassall, Caspar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of plugging an area of damaged mesh in a sifting screen is described. The method is applicable to screens of the type in which woven wire mesh is stretched tensioned and secured over a supporting frame containing a plurality of windows and in which local damage to the mesh is in an area of the mesh which overlies one of the windows. The method comprises the steps of inserting into the window a device which is a close fit therein and securing the device in the window so as to completely cover the area of damaged mesh. The device may comprise a farmer having stretched thereacross and secured thereto mesh similar to that stretched across the window in question or simply a plate or …
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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 July 16, 2002 and granted June 7, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 16, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 16, 2024.
- 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.