Two-layer paper machine fabric
CA 2020790 C · Owner: Hakkarainen, Merja · Inventors: Taipale, Seppo; Hakkarainen, Merja
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A two-layer paper machine fabric comprising one machine direction yarn system and two cross-machine direction yarn systems. The yarn systems are interlaced in accordance with an 8-shaft weave repeat. The yarns of the cross-machine direction yarn systems are positioned in two layers in such a way that the number of yarns in the upper system is double as compared with the lower cross-machine direction yarn system. To achieve a stable fabric each machine direction yarn passes during one weave repeat over two yarns in the upper cross-machine direction yarn layer and under one yarn in the lower cross-machine direction yarn layer. The passage of each machine direction yarn is reverse as compared …
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 July 10, 1990 and granted June 14, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 10, 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.