ALEXANDRIA, Va., April 7 -- United States Patent no. 12,594,683, issued on April 7, was assigned to KONINKLIJKE PHILIPS N.V. (Eindhoven, Netherlands).
"Hair-cutting head and hair-cutting device" was invented by Marius Iosif Boamfa (Veldhoven, Netherlands) and Babu Varghese (Eindhoven, Netherlands).
According to the abstract* released by the U.S. Patent & Trademark Office: "A hair-cutting head (10) for a hair-cutting device (100) having two sets (22, 24) of light sources which are configured to emit light predominantly in different respective wavelength bands. A first set (22) emits light in a wavelength band of 400-500 nm. A second set (24) emits light in a wavelength band of 500 nm and above. For improved eye safety, the first set of lig...