Pressurized screening device
CA 2018177 C · Owner: Oy Tampella Ab · Inventors: Hautala, Jouko; Holopainen, Pentti
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The pressurized screening device, according to the invention is designed for screening fibre pulps, especially paper pulp or corresponding. The pressurized, screening device is provided with a screenplate (11) with perforations, (12) cleaning means (17), being in, connection with and moving relative to the screenplate (11), means (2, 4, 15) for generating the relative motion between the screen plate (11), and said the cleaning means (17) piping means (8, 9, 10) firstly for, introducing fibre pulp into the pressurized screening device, secondly for conducting the accepted fibre pulp into the next process, stage and thirdly for discharging rejected pulp from the pressurized, screening device …
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 June 4, 1990 and granted July 27, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 4, 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.