Method of producing corrugated fiberboard article
CA 2012858 C · Owner: Oji Paper Co. Ltd. · Inventors: Watanabe, Masahiro; Sakurabashi, Ryoetsu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A corrugated fiberboard article having no wrinkles in the surface thereof is produced by previously forming slits or/and notches in at least one linerboard of corrugated fiberboard at predetermined positions, temporarily tacking the linerboard to the rest of the corrugated fiberboard with a fusible adhesive interposed therebetween temporarily, tacking an auxiliary sheet to the linerboard with a fusible adhesive interposed therebetween to form a corrugated fiberboard blank. The auxiliary sheet has an integral structure including covering portions which cover the slits or notches and cut portions each defined between each pair of adjacent covering portions. The corrugated fiberboard blank is …
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 March 22, 1990 and granted December 1, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 22, 2012.
- 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.