ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,485,499, issued on Dec. 2, was assigned to Worth-Pfaff Innovations Inc. (Deerfield, Ill.).

"System and methods for improved sheet metal cutting" was invented by Eric Pfaff (Bethesda, Md.) and Ronald K. Worth (Deerfield, Ill.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A plasma cutting system for measuring or monitoring the voltage between a plasma torch and the material being cut to determine a voltage or voltage signature and comparing that measurement against predetermined values to indicate that an initial pierce of the material is complete, and based on the measurement, moving the torch or the material to a different location for additional cuttin...