Canadian application, no grantCanada
Resilient cement
CA 2468940 A1 · Owner: Halliburton Energy Services, Inc. · Inventors: Brothers, Lance E.
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 method and composition is provided for sealing a subterranean zone penetrated by a well bore, wherein the composition basically comprises a mixture of latex, dithio carbamate, zinc oxide and sulfur.
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 2, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 2, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 2, 2024.
- 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 2, 2002
GrantedNo grant recorded
Term endedDecember 2, 2022
Patent numberCA 2468940 A1
Classification (IPC)E21B33/13 +2 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.