Replaceable digging tooth with conical cutting inserts
CA 2088678 C · Owner: Beach, Wayne H. · Inventors: Beach, Wayne H.; Frost, Robert L.; Stiffler, Stephen P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A digging tooth (10) including a body portion (12) and a plurality of hard wear resistant conical inserts (14). The body portion includes a generally planar distal portion (16) a medial portion (18), and a bifurcated proximal portion (20) having at least two prongs (22, 24) separated from each other to form a slot (28). The conical inserts are secured to and spaced along said distal portion and have a generally cylindrical body portion (38) and a top portion (40) which tapers to a point to form a tip (42) wherein the ratio of the diameter of the cylindrical body portion to the spacing distance between the tips of the conical inserts is between 0.50 and 0.80 and, preferably, 0.72.
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 April 2, 1991 and granted August 3, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 2, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 2013.
- 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.