Method and apparatus for manufacturing k-files and reamers
CA 2018373 C · Owner: Speiser, Robert D. · Inventors: Bernstein, Steven; Shearer, Dane; Speiser, Robert D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process and apparatus for grinding the proper taper and all of the flutes with the correct number of spirals simultaneously in a single cycle of the grinding machine. This is accomplished by passing a rotating stock to produce the correct number of spirals under a grinding wheel that is dressed with three or four properly formed ribs depending on how many flutes are being manufactured. These ribs are spaced so as to exactly match the lead distance of the rotating stock during 120° or 90° of revolution depending on whether a three or four fluted instrument is being manufactured. The height of each individual rib on the grinding wheel varies in relationship with each other to exactly match …
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 6, 1990 and granted August 21, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 6, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 6, 2012.
- 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.