Decontamination valve for a jet pipe in a paper or board machine
CA 2102489 C · Owner: Valmet Corporation · Inventors: Kyynarainen, Markku; Lemetyinen, Markku
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a decontamination valve for a jet pipe in a paper or board machine, including a disc valve having a closed position and an open position. The disc valve is in the closed position when the jet pipe is in operation and is in the open position when the jet pipe is being cleaned in order to remove cleaning/washing water used in the cleaning process. The disc valve is arranged to close in the same direction in which pressure effective in the jet pipe attempts to shift the valve.
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 November 4, 1993 and granted August 25, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 4, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 4, 2015.
- 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.