Well reamer
CA 2505412 C · Owner: Abdrakhamanov, Ruslan Gabdrashitovich · Inventors: Kashapov, Ilgiz Kamaevich; Khamitianov, Nigamatian Khamitovich; Abdrakhmanov, Gabdrashit Sultanovich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to drilling technique in particular, to devices for , borehole reaming within a specified interval. The housing has radial holes and a central straight-through channel in which , a spring-loaded , rod with holes in the upper and lower parts is located where the upper holes , are , covered in extension of the operating elements into working position. On the outer surface of , the housing the inclined slots are made in which legs are fastened with , journals fastened in , supports, and on which journals rolling cutters are fixed. The supports are rigidly connected , with cylindrical pistons arranged in inclined bores of the housing which , chambers , communicate with …
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 March 30, 2004 and granted May 22, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 30, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 2026.
- 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.