Expired Canadian patentCanada
A method and apparatus for demagnetizing a borehole
CA 2590372 C · Owner: Kruspe, Thomas · Inventors: Kruspe, Thomas
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 demagnetizing sub having an electromagnet or a rotating magnet is used for demagnetizing magnetized material in a wellbore.
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 December 13, 2005 and granted February 21, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 13, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 13, 2005
GrantedFebruary 21, 2012
Term endedDecember 13, 2025
Patent numberCA 2590372 C
Classification (IPC)H01F13/00
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.