Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Reexamination Certificate
2001-04-16
2004-05-18
Chen, Vivian (Department: 1773)
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
C428S212000, C428S412000, C428S421000, C428S423100, C428S446000, C428S473500, C428S474400, C428S480000, C428S483000, C428S500000, C428S515000, C428S910000, C359S015000, C359S487030, C359S488010, C359S493010, C359S494010, C359S506000, C359S580000, C359S584000, C359S586000, C427S162000, C427S163100, C427S355000, C427S369000, C427S372200, C264S284000, C264S299000, C264S319000
Reexamination Certificate
active
06737154
ABSTRACT:
BACKGROUND OF THE INVENTION
Multilayer optical stacks are well-known for providing a wide variety of optical properties. Such multilayer stacks may act as reflective polarizers or mirrors, reflecting light of all polarizations. They may also function as wavelength selective reflectors such as “cold mirrors” that reflect visible light but transmit infrared or “hot mirrors” that transmit visible and reflect infrared. Examples of a wide variety of multilayer stacks that may be constructed are included in U.S. patent application Ser. No. 08/402,041 filed Mar. 10, 1995, now U.S. Pat. No. 5,882,774.
A problem with multilayer stacks as known in the art is that the stacks themselves may not have all of the physical, chemical, or optical properties desired. Some way of otherwise supplying these desirable properties would therefore be useful.
SUMMARY OF THE INVENTION
According to one embodiment of the invention a multilayer film has adhered to one or both of its major surfaces at least one additional layer selected for mechanical, chemical, or optical properties that differ from the properties of the materials of the layers of the optical stack.
According to another embodiment of the invention a multilayer film has adhered to one or both of its surfaces an additional layer that will protect the multilayer optical stack.
According to another embodiment of the invention, certain constructions including holographic images (also known as “holograms”) and multilayer optical film are described.
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Jonza James M.
Lorimor Lynn E.
Venkataramani Shivshankar
3M Innovative Properties Company
Buss Melissa E.
Chen Vivian
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