Oxygen absorbent composition and method of preserving article with same
CA 2040993 C · Owner: Kawakami, Takamasa · Inventors: Murabayashi, Shigeru; Yoshino, Isamu; Naito, Akira
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An oxygen absorbent composition containing a linear hydrocarbon polymer having one or more unsaturated group or a mixture of a linear hydrocarbon polymer having one or more unsaturated group with an unsaturated fatty acid compound and an oxidation promoter as essential components and optionally containing a basic substance and/or an adsorption substance; an oxygen absorbent parcel formed by packing the oxygen absorbent composition with a gas-permeable packing material; and method of preserving an article by means of same.
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 April 23, 1991 and granted August 7, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 2013.
- 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.