Step tube rod, and drilling machine
CA 2411253 A1 · Owner: Furukawa Co. Ltd. · Inventors: Matsuda, Toshio; Kaneko, Tsutomu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a drill rod for a drilling machine, the rod outer diameter has a large diameter almost equal to the drill hole diameter an a male thread is formed , at one end and a female thread at the other end with at least one small , diameter portion adjacent the female thread. This step tube rod is capable of reducing the bending of holes. Further a drilling machine using this step , tube rod facilitates the positioning of the drill rod and is capable of efficiently and safely effecting the connecting and recovering 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 April 25, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 25, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 25, 2024.
- 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.