Method of forming a paper web
CA 2076640 C · Owner: Mitsubishi Heavy Industries, Ltd. · Inventors: Hergert, Richard E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is disclosed, far forming a paper web having a law tensile ratio. The, method includes the steps of ejecting stock (S) substantially , horizontally from a headbox (12), and receiving the , rejected stock (S) onto a substantially horizontally , disposed looped first wire (14) moving at substantially the, same speed and the same direction as the ejected stock, (S), The arrangement is such that a first portion of water, (18) is removed from the elected stock (S) downwardly , through the first wire (14) daring passage of the ejected stock (S) through an initial dewatering zone (20). The partially dewatered stock is sandwiched between the first wire (14} and a looped second wire …
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 February 19, 1991 and granted January 30, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 19, 2013.
- 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.