Drill and drill grinding method and apparatus
CA 1333010 C · Owner: Hosoi, Toshiaki · Inventors: Hosoi, Toshiaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A drill having a pair of cutting edges formed at one end of a shank and arranged symmetrically with respect to a point, each cutting edge comprising a central edge portion and an outer edge portion the, central and outer edge portions each extending substantially straight and being joined to each other with an obtuse angle formed therebetween when seen from below the central edge portion being formed with a central face substantially parallel to the axis of the drill the land portion of the two edge portions having a top face joined to the central face of the central edge portion and curved in a direction to give a large area to the central face; a method of grinding the drill with the …
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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
- Granted November 15, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 15, 2011.
- 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.