Method of drilling boreholes in areas with restricted access
CA 2272773 C · Owner: Roberts, Randall Scott · Inventors: Roberts, Randall Scott
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of drilling boreholes in areas with restricted access. There is provided an air source an air drill, a plurality of lengths of hose and a plurality of manual shut off valves. The lengths of hose are extended from the air source to a location where a borehole is to be drilled in the area of restricted access. A manual shut off valve is positioned on the length of hose at the location where the borehole is to be drilled and the air drill is attached. The borehole is drilled with the air drill using air to circulate cuttings to surface. The manual shut off valve is closed to maintain air pressure from the air source in the hose while the air drill is detached and further lengths 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
- Filed May 20, 1999 and granted October 17, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 20, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 20, 2021.
- 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.