Apparatus for, and a method of, cutting a blank
CA 2020483 A1 · Owner: Porucznik, Paul · Inventors: Porucznik, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
When a blank is cut from metal sheet which suffers from crystallographic anisotropy there is a, tendency for ears to be formed during subsequent forming operations, such as drawing or pressing. In order to compensate for this tendency, there may be used a metal blank which is not completely round but, has lobes at positions to cancel at least some of the valleys between the ears. There is described a punch and die which may be used to form such a lobed blank The punch has four circumferentially extending lobeforming sections each lobe-forming section is constructed by forming a stepped recess in the cutting edge of the punch In each lobe-forming section, the depth of the recess varies from …
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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 5, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 5, 2012.
- 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.