Process and apparatus for manufacturing endodontic instruments
CA 2359927 A1 · Owner: Miltex Dental, Inc. · Inventors: Graybill, Lonnie M.; Shearer, Jack L.; Munchel, Scott A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved process for producing an endodontic instrument (38) with a predetermined taper (80) having a plurality of flutes (94 95, 96), each with , a predetermined number of spirals over a predetermined length of the instrument are provided. The process basically comprises providing a grinding wheel (20) rotated about a first axis having a plurality of flute grinding ribs (40, 42, 44) and a rolled deformed metal grinding rib (46) extending from a periphery thereof. A rotating wire stock (12) is fed past the plurality of grinding ribs (40, 42, 44) and the rolled deformed metal grinding rib (46) at a controlled rate along a second axis so that a separate flute (94 95, 96) is , ground …
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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
- Filed January 25, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 25, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 25, 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.