Expired Canadian patentCanada
Portable top drive
CA 2199475 C · Owner: Nabors Industries, Inc. · Inventors: Richardson, Allan S.; Hope, Robert L.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A portable top drive drilling unit that is a self-contained assembly of components adapted for quick installation in a drilling rig and which requires a minimum of modification to the rig structure.
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 September 13, 1995 and granted November 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 13, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 13, 2017.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 13, 1995
GrantedNovember 27, 2001
Term endedSeptember 13, 2015
Patent numberCA 2199475 C
Classification (IPC)E21B3/02 +1 more
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.