US Patent Issued to National Oilwell Varco on Sept. 23 for "Insulated drilling systems and associated methods" (Texas Inventors)

ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,421,811, issued on Sept. 23, was assigned to National Oilwell Varco LP (Houston).

"Insulated drilling systems and associated methods" was invented by Tony Pink (Houston), Andrei Muradov (Houston), Russell Gilleylen (Spring, Texas) and Nooreldin Moussa (Spring, Texas).

According to the abstract* released by the U.S. Patent & Trademark Office: "An insulated drill pipe joint for a drill string of a well system includes an outer sub defining a central passage extending between a first end of the outer sub and a longitudinally opposed second end of the outer sub, wherein the outer sub includes a first connector located at the first end and a second connector located at the second end, an...