Rock boring process and apparatus
CA 2135975 C · Owner: Uti Energy Corp. · Inventors: Rowekamp, Keith J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A horizontal earth boring machine which is capable of transferring drill cuttings from the boring area back through the machine to allow for more efficient boring through both hard and soft rock strata is disclosed. The earth boring machine has an air powered hammer bit drill with air passageways therethrough for flushing the boring area and also has a rotary drive for use in rotating augers secured inside a casing for transporting the drill cuttings back through the casing and out an air diverter discharge near the front of the machine. The machine is capable of movement along a track so as to facilitate the boring operation.
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 November 16, 1994 and granted March 24, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 16, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 16, 2016.
- 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.