ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,473,798, issued on Nov. 18, was assigned to NCS Multistage Inc. (Calgary, Canada) and NCS Multistage LLC (Houston).
"Valve assemblies for high-temperature wells" was invented by Michael Werries (Calgary, Canada), Jesse Parker Powell (Houston) and James Gambrell King (Houston).
According to the abstract* released by the U.S. Patent & Trademark Office: "A valve assembly suitable for use in a high temperature well, such as a geothermal well. The valve assembly comprises a tubular housing having ports to allow fluid communication between a fluid passageway in the valve assembly and the outside of the valve assembly, an outer sleeve longitudinally slidable in the tubular housing, and an i...