Proppant for hydraulic fracturing of oil and gas wells and process for decreasing or eliminating "flow-back" effect in oil and gas wells
CA 2523872 C · Owner: De Paiva Cortes, Guilherme · Inventors: Curimbaba, Sebastiao; Warwick Kerr De Paiva Cortes, Gabriel; De Paiva Cortes, Guilherme
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a proppant for the hydraulic fracturing of oil or gas wells, which consists of a mixture of from 10 to 95% by weight of a spherical proppant and from 5 to 90% by weight of an angular material the , percentages being based on the total weight of the mixture. The proppant obtained according to the present invention is useful for eliminating or decreasing th e "flow-back" phenomenon in operations in oil or gas wells.
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 June 9, 2003 and granted August 21, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 9, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 9, 2025.
- 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.