A process for producing a liquid impermeable and flushable web
CA 2187389 C · Owner: Ahr, Nicholas Albert · Inventors: Ahr, Nicholas Albert; Dirk, Raymond John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for impregnating a resin into a substrate to form a web. The resin is impregnated into one side of the web so that the other side remains exposed. This arrangement allows the exposed side of the web to be dispersible in water while the impregnated side is water resistant. The impregnation may occur in zones and comprise one material or two or more materials. The resulting web is useful as abacksheet in disposable absorbent articles wherein i t is desired to have a barrier that is impermeable to body fluids yet flushable for disposal.
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 8, 1996 and granted August 22, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 8, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 8, 2018.
- 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.