Method for making a steel sheet useful in making a high strength drawn and ironed can
CA 2060044 C · Owner: Shimizu, Keiichi · Inventors: Kunishige, Fumio; Tanabe, Junichi; Shimizu, Keiichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for making a tin-coated steel sheet useful in manufacture of drawn and ironed cans eliminates the annealing step used in other manufacturing processes. The steel sheet comprises a steel slab having specified trace amounts of carbon silicon, manganese, sulphur, aluminum, nitrogen and phosphorus and has, excellent formability and corrosion resistance.
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 January 27, 1992 and granted September 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 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.