ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,428,332, issued on Sept. 30, was assigned to HERAEUS QUARZGLAS GMBH & Co. KG (Hanau, Germany).

"Method for producing a preform of an anti-resonant hollow-core fiber" was invented by Manuel Rosenberger (Hanau, Germany), Yusuf Tansel (Hanau, Germany), Jaqueline Plass (Hanau, Germany) and Jorg Werner (Hanau, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for producing a preform of an anti-resonant hollow-core fiber, comprising the method steps of a) providing a cladding tube, which has a cladding tube inner bore and a cladding tube longitudinal axis, along which a cladding tube wall extends, which is limited by an inner side and an outer ...