Rotary through dryer having multiple vacuum chambers and associated heaters
CA 1088743 A · Owner: Helversen, Frederick D. · Inventors: Helversen, Frederick D.; Rivers, Morris R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A fiber sheet manufacturing apparatus such as, a paper machine, is described including a rotary through, dryer for drying the sheet material on the same foraminous conveyor where it is initially formed. The dryer is provided with a plurality of separate vacuum chambers circumferentially spaced within the foraminous dryer drum which, are each in registration with a different one of a plurality of sources of hot air outside of the drum. The hot air is transmitted through the sheet material and the conveyor into the vacuum chambers to dry the sheet material. Each of the vacuum chambers and the hot air sources is independently controlled to provide different temperatures and vacuum …
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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
- Granted November 4, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 4, 1997.
- 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.