Grinding cup and wear part therefor
CA 2203673 C · Owner: Sandvik Intellectual Property Hb · Inventors: Bergqvist, Arne; Nava, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a grinding cup (10; 10'; 10") for a grinding machine used in the grinding of buttons of a rock drilling bit. The grinding cup (10; 10'; 10") includes a shank (11) flush channels (18, 25), and a wear part (12; 12'; 12"). The wear part (12; 12'; 12") has a cavity (15) which grinds the button (16). One of the flush channels referred to as, a second flush channel (25) terminates at least partly in the cavity. The grinding cup has a center axis (14). An intermediate conduit means (23; 23'; 23") is provided between a first flush channel (18) and the second flush channel (25), said intermediate conduit means having a larger radial extension than the second flush …
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 November 21, 1995 and granted June 12, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 21, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 21, 2017.
- 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.