Digging tooth and teeth arrayed in combination with endless excavating chain
CA 2005141 A1 · Owner: Charles Machine Works, Inc. (The) · Inventors: Martin, J. Scott
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An L-shaped digging tooth includes a trapezoidally configured shank having inner and outer sides. A toe portion projects laterally from one of its edges. An angle of about 90° ? 30° is defined between the general plane of the toe portion and the plane of the shank. The shank and toe portion terminate in a common, continuous cutting edge of L or V-shaped configuration having a convex outer boundary and a concave inner boundary. This cutting edge intersects at a leading cutter point a free, inner edge of the toe portion which extends along a line convergent with the shank portion plane. The tooth is hard-faced over a zone adjacent the common leading edge. The invention further relates to an …
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 December 11, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 11, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 11, 2011.
- 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.