Process for producing burr-free workpieces by blanking, in particular in a counterblanking tool
CA 2025685 A1 · Owner: Theodor Groz & Sohne & Ernst Beckert Nadelfabrik Commandit-Gesellschaft · Inventors: Haack, Johannes
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device and apparatus for producing burr-free workpieces by fine counterblanking from a blanking strip, sheet bar, coil material or the like which, is clamped between an upper and a lower blanking die and between an upper and lower punch; blanking is effected by cooperation of an upper and a lower punch, wherein a machine drive with a lifting force (F) for a unit comprising a blanking die and a punch is provided, and both the blanking die and the punch and another blanking die and punch, are subjected to pressures F2, F4 and F1, F3, respectively.
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 September 19, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 19, 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.