— Title: §§16+17 Hinterkopfprojektor
— Number: Published in DE10201700003336.6
— Country: Germany
— Inventor: Konstantin Roggatz
— Status: know-how in patent.
The original german patent includes many patentable inventions like this one. They are not continued in the international patent applications for various reasons. They reflect the development of the KaraSpace AR Technology over the last years and show different strains of the AR technology and accessory products. Original PDF is here..