ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,480,381, issued on Nov. 25, was assigned to NCS MULTISTAGE INC. (Calgary, Canada) and NCS MULTISTAGE LLC (Houston).
"Downhole valve assembly" was invented by Michael Werries (Calgary, Canada), Jesse Powell (Calgary, Canada) and James King (Houston).
According to the abstract* released by the U.S. Patent & Trademark Office: "A valve assembly for downhole completion operations and method for using the assembly is described. The valve assembly relies on non-polymeric interfaces between the valve components for sealing the valves without elastomeric materials, thereby making the valve assembly suitable for high temperature well operations, such as 320deg C. to 600deg C. which are typical...