Rotary drilling device
CA 1332408 C · Owner: Kaalstad, Oscar William · Inventors: Reid, Neil George; Kaalstad, Oscar William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rotary drilling device is disclosed of the type having a body connected to a rotary drive system for rotation about a primary axis in order to bore into the ground to form a cylindrical hole. The device has a rotary cutting member mounted on one side near the bottom of the body for rotation about an inclined axis of rotation which forms an angle with the primary axis of rotation. A counter-reaction member is disposed on the side of the body away from that carrying the cutting member and near its bottom. The counter-reaction member is constructed and positioned so as to be in contact with only the concave bottom of the hole and so that the maximum radial projection from the primary axis of …
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
- Granted October 11, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 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.