A method and an apparatus for production of a fibrous material containing curled fibers
CA 2175230 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 method is disclosed for production of a fibrous product containing curled fibers. Rectilinear bi-component fibers (17) are applied to the upper side of a raw material sheet (2) before it is introduced into a defibrator (1). Immediately before the introduction a heating, (at 8) is effected. When the recitilinear bi-component fibers (17) are introduced into the defibrator (1) the beater bars (9) would effect a, curling effect thereby providing a raw material comprising curled bi-component fibers. Hereby it is possible to substantially reduce the manufacturing costs, however, having the effect of curled bi-component fibers in the final fibrous product. Moreover a good bonding of, the fibers …
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 June 1, 1999. 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.