Multilayer felts
CA 2122616 C · Owner: Weavexx Corporation · Inventors: Gstrein, Hippolit; Zehle, Wilhelm
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A base fabric for press felts and a press felt incorporating that base fabric which includes an assembly of three or more separately woven fabric layers (10, 20 30). Each of the woven fabric layers making up the base fabric assembly is a single or multi-layer fabric, and they may be of the same or different weave patterns. The three or more fabric layers (10 20, 30) are assembled, one above the other and needled together with at least one batt layer on the papermaking surface of the felt. Preferably the yarns, on the top surface of the top fabric (10) will by virtue of the weave of the fabric, have long floats in the machine and/or cross machine direction to provide good paper web support. …
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 November 19, 1992 and granted February 3, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 19, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 19, 2014.
- 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.