Paper forming roll construction
CA 1106215 A · Owner: Diamond International Corporation · Inventors: Burkhart, James H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved Paper Forming Roll Construction ABSTRACT OF THE DISCLOSURE, Paper forming roll comprising a rotatable foraminous shell extending around a stationary pressure box having pressure chambers; spacing members secured to the box and extending between the box and shell and defining a forming zone a, primary holding zone, a transfer zone and a secondary holding zone, a first ported external wall of the box communicating the forming zone with a pressure chamber and a second external vertically extending ported wall of the box communicating the primary holding zone with a second pressure chamber; and a drip element parallel to said second wall whereby fiber in the water past the primary …
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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 August 4, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 4, 1998.
- 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.