A friction rock stabilizer
CA 2123306 C · Owner: Ingersoll-Rand Company · Inventors: Landsberg, Thomas J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A friction rock stabilizer (I) includes a center spine (7) a plurality of arms (15) extending radially outwardly therefrom for, urging a plurality of friction surfaces (13) into resilient contact with a borehole (14) wall. The friction surfaces (13) are positioned on an arc of a circle measured around the center axis of the borehole which arc spans a center angle of at least 180 degrees.
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 November 10, 1992 and granted September 29, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 2014.
- 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.