Mechanical partial neutralization of hydrogen bonds for production of a softer and more silky air-laid fibrous product
CA 2175239 C · Owner: Houlberg, Vibeke Kobs · 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 provided for producing a soft and silky air-laid fibrous product. After the forming of a product a two-directional stretching is affected thereby establishing a fine mosaic pattern of invisible lines. In said lines the covalent bonds are maintained whereas the hydrogene bonds are neutralized. Hereby a very soft and silky product is obtained having a good hand and feel.
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 February 23, 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.