Apparatus for cleaning strips before press forming, having de-oiling rolls and tacky rolls to remove oil and foreign matters
CA 2101573 C · Owner: Niimi, Yuji · Inventors: Niimi, Yuji; Nishimoto, Yutaka; Ikemoto, Kimikazu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cleaning apparatus for removing foreign matters from workpieces in the form of strips or sheets cut from a larger blank, before the workpiece is subjected to a press forming operation, which apparatus includes a feeding device for feeding the successive workpieces, de-oiling rolls disposed in an upstream portion of a feed path of the workpieces as seen in a feeding direction and rotated in pressing rolling contact with the surfaces of each workpiece as each workpiece is fed, so as to remove by absorption oily substances from the surfaces of the workpiece and tacky, rolls disposed downstream of the de-oiling rolls as seen in the feeding direction and rotated in pressing rolling contact …
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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 July 29, 1993 and granted October 7, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 29, 2015.
- 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.