Hewlett-packard Development Company, L.p.

Herbert Thomas Etheridge, Iii

James William Stasiak

Garry Dale Hinch

Timothy Dean Strecker

Henry Lewis

Carol McConica

Embodiments of a printed security mark and a process are disclosed.

Printed security mark

An apparatus, including a substrate, having an internal surface where at least a portion of the internal surface has a smoothly varying curvature in three orthogonal directions. The apparatus also includes a photonic crystal disposed over and conformal to at least a portion of the internal surface having the smoothly varying curvature.

Apparatus having a photonic crystal

An apparatus, including a substrate, where at least a portion of the substrate has a convex surface, and a photonic crystal disposed over the convex surface. The photonic crystal is substantially conformal to at least a portion of the convex surface.

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Corvallis, OR, United States of America

Herbert Thomas Etheridge, Iii