Fiberboard and method of making absorbent article using fiberboard
CA 2134641 C · Owner: Bitowft, Bruce Kevin · Inventors: Bitowft, Bruce Kevin; Puchert, Karsten
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a process of making an absorbent article (351) such as a sanitary napkin or a disposable diaper hydrophilic fibers and, crimped or coiled synthetic fibers are supplied in a single fiberboard to a defiberising means such as a hammermill (322). The process results in a homogeneous and resilient blended absorbent core that can be produced using a single defiberising unit. The crimped or coiled fibers pass through the defiberising means without their two- or three-dimensional structure being adversely affected at a relatively low defiberisation energy.
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 April 26, 1993 and granted March 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 26, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 26, 2015.
- 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.