ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,428,952, issued on Sept. 30, was assigned to SAUDI ARABIAN OIL COMPANY (Dhahran, Saudi Arabia).

"Hydrostatic bailer and lead impression block combination tool for downhole fish diagnosis and solids stripping through sample collection" was invented by Ghulam Murtaza Kalwar (Udhailiyah, Saudi Arabia) and Abdullah A Mulhim (Udhailiyah, Saudi Arabia).

According to the abstract* released by the U.S. Patent & Trademark Office: "An apparatus includes a hydrostatic bailer and a lead impression block. The hydrostatic bailer is disposed in the well and removes debris from the fish using a plunger, a shear pin, and a valve. The valve controls hydraulic communication between an orifice of a hol...