Absorbent material and method of making same
CA 2132964 A1 · Owner: Brassington, Nigel John · Inventors: Welburn, Jean; Brassington, Nigel John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An absorbent material suitable for use as a medical or hygienic absorbent and comprises a non-woven fibre sheet having dense surface layers (10) and between these layers a less dense region where most of the fibres extend in the plane of the sheet. Transversely extending fibres (16) help to bind the material the fibres, also being bonded to some extent by a hot melt bonding material e.g. core/sheath-type bi-component fibres. The material is made by forming a blend of fibres, including a minor weight of hot melt fibres, by cross-lapping a plurality of layers (14) to form a web subjecting the web to needling at low punch density with penetration through the web, thereafter subjecting surface …
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 29, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 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.