Operation of a high speed paper making machine
CA 1202806 A · Owner: Jwi Ltd. · Inventors: Hansen, Victor E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The disclosure teaches a method of improving the operation of a high speed paper forming machine using synthetic forming fabrics by replacement of the perforated vacuum couch roll with a solid power or drive roll preceded immediately upstream by a specially designed static slotted couch box, having one or more narrow slot openings with land areas of wear resistant material having low coefficient of friction with the forming fabric and, operating with a source of vacuum in the order of 15 to 30 inches of mercury. --1--
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
- Granted April 8, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 8, 2003.
- 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.