Production unit of long-term preservable lunch and lunch box used for said lunch
CA 2113441 C · Owner: Niwa, Mitsuo · Inventors: Niwa, Mitsuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In accordance with the present invention there can be, mass produced long-term preservable lunches in a short period of time, because a series of such operations as formation cleaning, sterilizing, dishing-up, sealing and filling the lunch box with an inert gas are carried out consistently by virtue of the production unit of lunches of the present invention. Further, because the lunches are allowed to pass through successively the gas chambers filled with the inert gas, no insufficient filling of the lunches with the inert gas will occur. Further, the lunch boxes can individually be filled with the inert gas when each lunch box is provided with a sealing valve and filled with the inert gas …
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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 May 20, 1992 and granted February 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 20, 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.