Absorbent core for use in catamenial products
CA 2113416 C · Owner: Buenger, Daniel E. · Inventors: Hammons, John L.; Buenger, Daniel E.; Horney, James C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Curled, twisted cellulosic fibers are reduced in size by mechanical means i.e. by refining. The refined fibers are formed into sheets which are used as an absorbent layer in diapers bandages and, especially, in sanitary napkins. In one mode the refined, fibers can be used to provide shaped sanitary devices. In an optional mode fibers having intra-fiber capillary channels can be used to direct fluids into absorbent sheets comprising the refined curled cellulosic 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 July 6, 1992 and granted January 12, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 6, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 6, 2014.
- 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.