ALEXANDRIA, Va., March 31 -- United States Patent no. 12,590,647, issued on March 31, was assigned to Fieldpiece Instruments Inc. (Orange, Calif.).

"Method and apparatus for valve core installation/removal" was invented by Jason Corbett Gilley (Orange, Calif.) and Henry J. Kuo (Yorba Linda, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A valve core installation/removal tee enable the removal and or replacement of a Schrader(R) valve insert without evacuating the refrigeration system. The use of a valve core installation/removal tee also permits the valve core to be removed and maintenance of the HVAC system to be performed without the flow restriction of the valve core and core depressor."

The paten...