Process for the production of a fibrous sheet material
CA 2175229 C · Owner: Kroyer, Karl Kristian Kobs (Deceased) · Inventors: Kroyer, Karl Kristian Kobs (Deceased)
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fibrous shoe; material is produced by the steps of dry-laying cellulosic fibres on a continuously moving support to form a layer thereon, and wetting said layer sufficiently to cause hydrogen bonds to be formed to a desired degree. The fibrous sheet material thus produced may, if desired, be further processed or finished by known methods to obtain a variety of final products. For carrying out the method an apparatus may be used, which in a preferred embodiment comprises a dry-laying fibre distributor mounted above the foraminous wire of a paper machine based on wet-laying.
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 October 28, 1994 and granted April 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 2016.
- 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.