Coated paperboard and paperboard containers having a microwave interactive layer which emits none or very low amounts of benzene in microwave applications
CA 2233825 A1 · Owner: Fort James Corporation · Inventors: Shanton, Kenneth J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved, coated microwaveable paperboard or container useful for forming substantially rigid food containers such as plates bowls, trays and the like and a process from producing the improved, coated paperboard is provided. The microwaveable paperboard and food containers. at a temperature in excess of 430°F evolves less than 0.1 milligrams of benzene per square inch preferably less than 0.04 milligrams. Said paperboard and food containers are produced from a sized paperboard blank wherein a base coat and top coat comprise a mixture of an inorganic pigment and aliphatic copolymers. A base coat comprising an aliphatic latex and a pigment is applied directly to the paperboard, and a top …
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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 2, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 2, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 2020.
- 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.