Tool centralizer
CA 1164336 A · Owner: Hansen, Roy · Inventors: Hansen, Roy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for centralizing a tool in a drill hole includes a hollow/ generally cylindrical casing which contains an elongated cavity and a plurality of flexible fingers extending outwardly from the casing for properly positioning the casing in a drill hole. In use, the device is attached to a drill string beneath a tool to be centralized. The casing is defined by two threadedly interconnected elements, which together define the elongated cavity with a rod slidable in the cavity. The rod includes holes for receiving the fingers. By pressing the rod downwardly in-the cavity, the fingers are jammed against the bottom edges of apertures in the bottom tubular element. Thus the device is …
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
- Granted March 27, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 27, 2001.
- 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.