Heat-insulating packaging box
CA 1320931 C · Owner: Kato, Eiji · Inventors: Kato, Eiji; Kuboshima, Katsumi; Kaneko, Tomoyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A packaging box is used for packaging frozen food with an improved heat-insulating property. The movement of air surrounded by a corrugated core of a conventional corrugated card-board is interrupted, thereby enhancing the heatinsulating property. The air is prevented from permeating through the corrugated property. Further in order to improve the heat-insulating property, laminated aluminum foil is used.
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
- Granted August 3, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 3, 2010.
- 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.