Method of producing coreless toilet paper roll and coreless toilet paper produced thereby
CA 2096140 C · Owner: Watanabe, Sukesada · Inventors: Kaji, Kazushi; Watanabe, Sukesada
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coreless toilet paper roll is produced by winding toilet paper such that the winding speed in the winding apparatus is faster than the paper feeding speed in the paper feeding - and progressing apparatus during a, beginning period and final period of the toilet paper winding step, by leaving the wound toilet paper roll in place, with the winding shaft leaves projecting radially outwardly for a pre-determined time after the winding step and thereafter, by shrinking the leaves and removing the toiler paper roll from the winding shaft. The toilet paper roll so produced has a roll body made of a wound toilet paper material, wherein a beginning layer thereof is wound tightly, and subsequent …
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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 15, 1992 and granted July 14, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 15, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 15, 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.