Method and apparatus for dewatering a suction papermaking roll
CA 2308050 A1 · Owner: Herring, Robert H. · Inventors: Herring, Robert H.; Anderson, Dennis W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An air delivery device is provided for dewatering a suction roll in a paper machine by applying pressurized air to expel residual water or debris outwardly from through-holes. The air delivery device is positioned at a suitable circumferential position of the suction roll to prevent water carryover back to the suction box location. In one preferred embodiment an internal, blowbox is mounted near the inner surface of the suction roll for blowing out water from the suction roll holes to augment the natural centrifugal forces. The blowbox can be used as a standalone dewatering unit, or in conjunction with an external doctor blade or wipe. In another preferred embodiment at least, one air …
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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 May 11, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 11, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 11, 2022.
- 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.