ALEXANDRIA, Va., May 5 -- United States Patent no. 12,620,685, issued on May 5, was assigned to TERASI AB (Varmdo, Sweden).

"Variable length vertically stacked nested waveguide device" was invented by James Campion (Varmdo, Sweden) and Bernhard Beuerle (Solna, Sweden).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a variable length vertically stacked nested waveguide device, comprising a series of, N, waveguide components. Each waveguide component comprises a waveguide layer comprising a waveguide opening, a recess layer comprising a recess, a conductive material coating. The waveguide components are nested within each other to create a nested structure with a combined wavegui...