Method of and apparatus for forming a disc-shaped blank
CA 2179225 C · Owner: Yamanaka, Shigeaki · Inventors: Yamanaka, Shigeaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided a method for forming a discshaped blank in which a disc-shaped thin plate material is at, an outer peripheral portion thereof swaged towards an axial, side of the plate material with a roll die to thicken the outer peripheral portion and is shaped into a cross-sectional configuration corresponding to that of a dish the method, comprises the steps of: sandwiching and securing between a pair of sandwiching members the disc-shaped thin plate material except for the outer peripheral portion including a swaging portion; swaging the swaging portion projecting from the sandwiching members so that an outermost end of the swaging portion may be shaped into a cross-sectional …
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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 June 17, 1996 and granted May 23, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 17, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 2018.
- 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.