Web former
CA 2009330 C · Owner: Beloit Corporation · Inventors: Turner, J. Arthur
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A paper forming apparatus has a lower looped forming wire disposed for a portion of its travel over a curved apron board. The paths of forming wire travel upstream and downstream of the apron board diverge. Such divergence allows a secondary headbox to be brought into such a juxtaposition with the forming wire coming off the apron board as to permit the stock stream to impinge the forming wire both at a low angle and at a short distance to enhance formation of an additional web ply over a previously formed web ply. In one embodiment an upper, looped forming wire is brought into co-running engagement with the lower forming wire over the downwardly extending downstream path of travel. In …
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 5, 1990 and granted September 6, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 5, 2012.
- 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.