LOS ANGELES – The US Patent and Trademark Office has issued P. Kay Metal a US patent covering its chemical dross elimination and reduction formula, as used in the soldering process.

The patent covers the use of a variety of liquid chemical additives, including the formula sold as MS2, used to eliminate solder dross and recover usable metal in the wave soldering process.

The patent is effective Jan. 4.

The company has applied for additional patents in other countries.