Method of blasting rock using air tubes charged in a blasthole
CA 2350332 C · Owner: Kang, Dae Woo · Inventors: Kang, Dae Woo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordNo Claude kit for weapons
Claude doesn't help design weapons, ammunition or explosives, so this page has no Reinvent kit. To develop this one, work with a federally licensed manufacturer (many of these items are regulated) and a registered patent attorney or agent, listed on the USPTO roster.
Abstract From the Canadian patent
A rock blasting method is provided in which a series of aligned boreholes are charged with explosives and air tubes in a predetermined pattern. The air tube is a, cylindrical flexible tube having a predetermined width and length to be fitted with, the borehole. In one preferred form each borehole is charged with the , explosives and detonator with one air tube installed above the explosives. A stemming material, is installed above the air tube. For example in a 45-millimeter diameter and , 2.5, meter long borehole the length of explosive charging is 0.8 meters the co-, operating, charge weight was 0.648 Kg the total amount of explosives 3.24 Kg the length , of, the air tube 1.0 meter the …
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.
Why it's free to use
- Filed February 16, 2000 and granted September 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 16, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 16, 2022.
- 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.