Tissue with strikethrough resistance
CA 2335111 C · Owner: Hu, Sheng-Hsin · Inventors: Mitchell, Joseph; Hu, Sheng-Hsin; Mcconnell, Wesley James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A toilet tissue product (20) may include a first cellulosic ply (22) and a second cellulosic ply (26). Desirably, the first cellulosic ply further includes a single layer (24) and the second cellulosic ply further includes a single layer (28). At least one ply may have a region (30) that prevents fluid from striking through the tissue product.
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 June 25, 1999 and granted January 4, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 25, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2021.
- 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.