Method of preparing laminated holograms
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United States of America Patent
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Dec 11, 1990
Grant Date -
N/A
app pub date -
Dec 8, 1989
filing date -
Dec 20, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is described a method of preparing a hologram laminated between two sheets of glass which comprises forming an assembly which comprises a sheet of glass, a sheet of polyvinyl butyral, a film which contains a silver halide hologram, a sheet of polyvinyl butyral and a sheet of glass and then subjecting the assembly of a pressure of between 12 and 15 bars at a temperature about 110.degree. C. which is the softening temperature of polyvinyl butyral.
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