Cutting tool for machining bores in materials having spring-back
CA 2346304 A1 · Owner: Kennametal Inc. · Inventors: Magill, William C.; Tunis, William B.; Baldwin, Gary D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cutting tool (1) such as a drill (2) or reamer (35) for machining a bore (3) in a workpiece (4) is provided with at least one chamfered cutting edge (5) on its distal end having an enlarged radial extent. The chamfered edge (5) is defined between a tapered leading end (22) and an undercut end (23), and has , a radial extent about 2.5 % greater than the radial extent (R1) of the shaft (7) of the tool. At least 40 % of the length of the chamfered edge (5) is substantially parallel to the axis of rotation of the tool shaft (7).
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 June 10, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 10, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 2021.
- 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.