ALEXANDRIA, Va., Jan. 27 -- Afton Chemical, Richmond, Virginia, has been assigned a patent (9,873,848) developed by two co-inventors for "fuel additives for treating internal deposits of fuel injectors." The co-inventors are Xinggao Fang, Midlothian, Virginia, and Scott D. Schwab, Richmond, Virginia. The abstract states: "Methods for improving the injector performance, unsticking fuel injectors, and reducing an amount of alkali metal carboxylate deposits on internal components of fuel injectors. . . .