Appeal No. 97-0178
Application 08/355,326
BACKGROUND
The appellant's invention relates to a substrate which receives and retains imaging
thereon. The imaging being a first machine readable code imaged on the substrate. The
first code is opaque to a first predetermined wavelength of electromagnetic energy (infra-
red) and transparent to a second predetermined wavelength of electromagnetic energy
(visible light). An overlay security block is also provided which substantially completely
covers and visibly obscures the first code. The overlay is transparent to the first
predetermined wavelength and opaque to the second wavelength of electromagnetic
energy. The security block may also be a second bar code. An understanding of the
invention can be derived from a reading of exemplary claim 1, which is reproduced below.
1. A substrate capable of receiving and retaining imaging thereon,
comprising:
a first machine readable identification code imaged on a predetermined
area of said substrate, said first code opaque to a first predetermined
wavelength range of electromagnetic energy and transparent to a second
predetermined wavelength range of electromagnetic energy different from
the first range; and
an overlay imaged over and at least partially covering said first code, said
overlay transparent to said first predetermined wavelength range of
electromagnetic energy and opaque to the second predetermined
wavelength range of electromagnetic energy different from the first range;
and
wherein said overlay comprises a security block substantially completely
covering and visibly obscuring the first code.
2
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