Grinding cup for drill bits
CA 2312100 A1 · Owner: Norman, Murray · Inventors: Norman, Murray
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A grinding cup for detachable connection to a draft shaft of a grinding machine for grinding buttons, on drill bits comprises top and bottom surfaces and a lower grinding section , having a centrally disposed recess formed in the bottom surface of the grinding cup and having the desired profile for, the button to be ground; wherein the periphery of the lower grinding section comprises a series of, reinforcing ribs extending longitudinally towards the top surface; and wherein the peripheral edge, of the bottom surface is bevelled to facilitate during grinding, the removal , of cutting fluid and steel from the face of the bit around the button through the spaces between the ribs; and …
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 22, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 22, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 22, 2022.
- 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.