ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,444,558, issued on Oct. 14, was assigned to S&C Electric Co. (Chicago).

"System and method for point on wave closing of a vacuum interrupter" was invented by David G. Porter (East Troy, Wis.), Thomas S. Kelley (Highland Park, Ill.), Joseph W. Milton (Milwaukee) and Andrew B. Berman (Racine, Wis.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A system and method for point on wave closing of a switching device, where the close initiation point is selected so that a minor current loop is generated that minimizes the accumulated current during the closing operation. The method includes determining bounce characteristic of contacts in the switching device du...