Cooling drum for casting thin cast pieces and method and apparatus for forming dimples in peripheral surface of the drum
CA 2076747 C · Owner: Nippon Steel Corporation · Inventors: Minamida, Katsuhiro; Nishizawa, Fumihiko; Kido, Motoi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cooling drum (1) for use in casting a thin cast strip is rotated about its axis while a laser beam (10a) of a wavelength of from 0.30 µm to 1.07 µm is irradiated onto a peripheral surface of the drum to form dimple (2) therein. At this time, at least one of the oscillation period of the laser beam, the laser output and the divergence angle of the beam is controlled to assure that each dimple (2) has a depth of not less than 50 µm and a diameter of less than 500 µm and the distance measured between the centers of each adjacent pair of dimples ranges from 1.05 times to 5 times the dimple diameter. At least one of the steps of adjusting the oscillation period of the laser beam and causing …
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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 January 9, 1992 and granted August 26, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 9, 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
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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.