US Patent Issued to BLAC on Aug. 5 for "Catalyst control and withdrawal valve with tight shutoff capability" (Illinois Inventor)

ALEXANDRIA, Va., Aug. 6 -- United States Patent no. 12,379,034, issued on Aug. 5, was assigned to BLAC INC. (Elmhurst, Ill.).

"Catalyst control and withdrawal valve with tight shutoff capability" was invented by Philip B. Black (Elmhurst, Ill.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A slide valve having a valve disc that is slidably movable between a fully-retracted fully-open position and a fully-extended fully-closed tight shutoff position by an actuating stem. The actuating stem is flexibly coupled to the valve disc. The valve disc is selectively modulated between the fully-extended fully-closed tight shutoff position and a partially-retracted non-tight shutoff position to prevent sticking of the v...