Synthetic colour hologram
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 24, 2009
Grant Date -
Oct 6, 2005
app pub date -
May 23, 2003
filing date -
May 24, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A surface relief hologram that includes two or more patterns, each pattern being sensitive to different radiation wavelengths. The hologram is made by defining relief features that are sensitive to different wavelengths, and in particular, to one wavelength that is visible to the unaided human eye and to one wavelength that is invisible to the unaided human eye. These relief features of different sensitivities are interspersed over the surface of the substrate in which the hologram is defined. By providing two patterns of different sensitivities, when the hologram is used in a security device, security is improved. Despite this improved security, the hologram can be mass manufactured using known techniques.
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Cited Art Landscape
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