Disposable body warmers
CA 2004292 C · Owner: Mycoal Warmers Company Limited · Inventors: Usui, Akio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A disposable body warmer comprising a flat bag and put in a flat form having a thickness of 2 to 5 mm a heat , generating agent composed of iron powder as a main ingredient and mixed therewith 9 to 11 % by weight of a water-retaining agent 18 to 22 % by weight of water, a heat genaretion promotor and common salt or sodium chloride. The flat bag is provided with one air-permeable surface having air permeability per unit time limited to 5000 to 10000 sec/100 cc so as to bring about a reduction in the pressure accompanying oxidative heat generation of the heat generating agent packed in said flat bag and the, other surface of the flat bag is provided with a nontransferable self-adhesive layer.
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 November 30, 1989 and granted June 13, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 2011.
- 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.