Longitudinal structures forming multiple layers around the core

Official title: {Longitudinal structures forming multiple layers around the core, e.g. arranged in multiple rings with each ring having longitudinal elements at substantially the same radial distance from the core, having rotational symmetry about the fibre axis}

G02B6/02361 (Longitudinal structures forming multiple layers around the core) appears on 201 US grants and 238 published applications in this corpus.