Cold deformable, high strength, hot rolled bar and method for producing same
CA 2135255 C · Owner: Heitmann, William E. · Inventors: Brown, Birchel S.; Heitmann, William E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A billet of steel has a composition comprising small amounts of hardenability agents. The billet is hot rolled into a continuous bar, in two hot rolling stages with an intervening cooling step employing a turbulent cooling liquid. After the second hot rolling stage, the bar is gathered into a succession of closely overlapping loops and moved along a roller conveyor where the overlapping loops are cooled by air blowers, after which the bar is coiled. The resulting hot rolled bar has a microstructure consisting essentially of bainite in fine-sized packets reflecting an average austenitic grain size, before the gathering and cooling steps of 8-11 ASTM. A threaded fastener in its final form can …
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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 November 7, 1994 and granted May 16, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 7, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 7, 2016.
- 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.