ALEXANDRIA, Va., March 17 -- United States Patent no. 12,578,593, issued on March 17, was assigned to SPIRAL (Caen, France).
"Spiral dioptre with meridians of different optical power" was invented by Laurent Galinier (Bordeaux, France).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical device having an optical axis. The device includes at least one surface with at least two meridians, at least one portion of which forms, seen face-on, at least one spiral segment the central point of which is on the optical axis. Each spiral segment defining meridians of different optical powers. The focus obtained extends over a tubular region."
The patent was filed on June 29, 2020, under Application No. 17/622,664....