Felt, in particular a papermaking-machine felt, and method for its manufacture
CA 2044385 C · Owner: Schaaf, Walter · Inventors: Best, Walter; Eschmann, Sylvester; Schaaf, Walter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A felt, especially for the press part of a papermaking machine, comprises at least one support belt and at least one fiber belt deposited on and affixed to it. In order to impart to such a fell: improved operational properties while retaining adequate transverse stability and in order to manufacture it at substantially lower cost, the support belt (s) 45, 50 57, 58, 64, 71, 72 each are, composed of at least one support-belt strip 46 51, 52, 59, 60, 65, 66, 73, 74, 75 with a width less than that of the support belt(s) 45, 50, 57, 58, 64, 71, 72 , said strip(s) being continuously wound essentially in the direction of advance of the felt 42 47, 53, 61, 67 and also spirally transverse to it. …
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 June 12, 1991 and granted June 29, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 12, 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.