US5233465A
Expired / Lapsed
US
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Visibly transparent infrared reflecting film with color masking
Assignee: 3M Innovative Properties Co
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Filing: 1992-05-27
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Granted: 1993-08-03
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Expires: 2012-05-27
Abstract
Abstract A polymeric multilayered film which reflects wavelengths of light in the infrared region of the spectrum while being substantially transparent to wavelengths of light in the visible spectrum without the effects of visibly perceived iridescent color is provided. The polymeric multilayered infrared reflecting film comprises at least two diverse, substantially transparent polymeric materials, with the layers having an optical thickness of between 0.09 μm and 0.45 μm and the polymeric materials having a different index of refraction such that light is reflected in the infrared portion of the spectrum. A color masking film is associated with the polymeric film which reflects light substantially uniformly over the visible portion of the spectrum to eliminate perceived iridescent color.
Inventors
- 👤 John A. Wheatley
- 👤 Walter J. Schrenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:13
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/281; G02B5/282
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
170 words
A substantially colorless polymeric multilayered film having at least two major surfaces and which reflects a majority of light in the infrared region of the spectrum while transmitting a majority of light in the visible region of the spectrum comprising, multiple alternating layers of at least two diverse, substantially transparent polymeric materials which differ in refractive index by at least about 0.03, said layers having an optical thickness of between about 0.09 μm and 0.45 μm and each of said polymeric materials having a different index of refraction such that said film reflects light in the infrared portion of the spectrum, and means associated with said film for masking any iridescent visible color reflected from said layers such that there is an absence of visibly perceived color reflected from said film, said color masking means comprise a sufficient number of alternating layers of substantially transparent diverse polymeric materials, a substantial majority of said layers having an optical thickness of not less than 0.45 μm or not greater than 0.09 μm.
Claim 2
Dependent Claim
170 words
A substantially colorless polymeric multilayered film having at least two major surfaces and which reflects a majority of light in the infrared region of the spectrum while transmitting a majority of light in the visible region of the spectrum comprising, multiple alternating layers of at least two diverse, substantially transparent polymeric materials which differ in refractive index by at least about 0.03, said layers having an optical thickness of between about 0.09 μm and 0.45 μm and each of said polymeric materials having a different index of refraction such that said film reflects light in the infrared portion of the spectrum, and means associated with said film for masking any iridescent visible color reflected from said layers such that there is an absence of visibly perceived color reflected from said film, said color masking means comprise a sufficient number of alternating layers of substantially transparent diverse polymeric materials, a substantial majority of said layers having an optical thickness of not less than 0.45 μm or not greater than 0.09 μm.
Claim 3
Dependent Claim
21 words
The substantially colorless polymeric multilayered film of claim 1 wherein said film reflects light in the ultraviolet region of the spectrum.
Claim 4
Dependent Claim
31 words
The substantially colorless multilayered film of claim 1 in which said film includes first (A), second (B), and third (C) diverse polymeric materials of alternating layers having a repeating pattern ABCB.
Claim 5
Dependent Claim
37 words
The substantially colorless polymeric multilayered film of claim 3 in which said first polymeric material is polystyrene, said second polymeric material is a copolymer of styrene and methyl methacrylate, and said third polymeric material is polymethyl methacrylate.
Claim 6
Dependent Claim
37 words
The substantially colorless polymeric multilayered film of claim 3 in which said first polymeric material is polycarbonate, said second polymeric material is a copolymer of styrene and methyl methacrylate, and said third polymeric material is polymethyl methacrylate.
Claim 7
Dependent Claim
28 words
The substantially colorless multilayered film of claim 1 in which said film includes first (A) and second (B) polymeric materials of alternating layers having a repeating pattern ABAB.
Claim 8
Dependent Claim
24 words
The substantially colorless polymeric multilayered film of claim 6 in which said first polymeric material is polystyrene and said second polymeric material is polymethylmethacrylate.
Claim 9
Dependent Claim
30 words
The substantially colorless polymeric multilayered film of claim 1 wherein said color masking means comprise a masking film which reflects light substantially uniformly over the visible portion of the spectrum.
Claim 10
Dependent Claim
146 words
A substantially colorless polymeric multilayered film having at least two major surfaces and which reflects a majority of at least two major surfaces and which reflects a majority of light in the infrared region of the spectrum while transmitting a majority of light in the visible region of the spectrum comprising, multiple alternating layers of first (A), second (B), and third (C) diverse substantially transparent polymeric materials which differ in refractive index by at least about 0.03, said layers having an optical thickness of between about 0.09 μm and 0.45 μm and each of said polymeric materials having a different index of refraction such that said film reflects light in the infrared portion of the spectrum, and means associated with said film for masking any iridescent visible color reflected from said layers such that there is an absence of visibly perceived color reflected from said film.
Claim 11
Dependent Claim
146 words
A substantially colorless polymeric multilayered film having at least two major surfaces and which reflects a majority of at least two major surfaces and which reflects a majority of light in the infrared region of the spectrum while transmitting a majority of light in the visible region of the spectrum comprising, multiple alternating layers of first (A), second (B), and third (C) diverse substantially transparent polymeric materials which differ in refractive index by at least about 0.03, said layers having an optical thickness of between about 0.09 μm and 0.45 μm and each of said polymeric materials having a different index of refraction such that said film reflects light in the infrared portion of the spectrum, and means associated with said film for masking any iridescent visible color reflected from said layers such that there is an absence of visibly perceived color reflected from said film.
Claim 12
Dependent Claim
20 words
The substantially colorless polymeric multilayered film of claim 9 wherein said alternating layers of polymeric materials comprise polycarbonate and polymethylmethacrylate.
Claim 13
Dependent Claim
20 words
The substantially colorless polymeric multilayered film of claim 9 wherein said alternating layers of polymeric materials comprise polystyrene and polymethylmethacrylate.
Claim 14
Dependent Claim
19 words
The substantially colorless polymeric multilayered film of claim 9 wherein said color masking means is laminated to said film.
Claim 15
Dependent Claim
39 words
The substantially colorless polymeric multilayered film of claim 9 wherein said color masking means comprise a substantially colorless metal oxide or metal halide film having sufficient reflectance to mask the visible iridescent color effects of the infrared reflecting film.
Claim 16
Dependent Claim
19 words
The substantially colorless polymeric multilayered film of claim 13 wherein said color masking means is deposited on said film.
Claim 17
Dependent Claim
49 words
The substantially colorless polymeric multilayered film of claim 9 wherein said color masking means comprise a sufficient number of alternating layers of substantially transparent diverse polymeric materials, a substantial majority of said layers having an optical thickness of not less than 0.45 μm or not greater than 0.09 μm.
Claim 18
Dependent Claim
27 words
The substantially colorless polymeric multilayered film of claim 1 wherein said color masking means are located on one or both of said major surfaces of said body.
Claim 19
Dependent Claim
22 words
The substantially colorless polymeric multilayered film of claim 1 wherein said color masking means are located between interior layers of said body.
Claim 20
Dependent Claim
23 words
The substantially colorless polymeric multilayered film of claim 1 in which there is a layer thickness gradient across the thickness of said film.
Claim 21
Dependent Claim
22 words
The substantially colorless polymeric multilayered film of claim 17 in which said layer thicknesses increase monotonically across the thickness of said film.
Claim 22
Dependent Claim
29 words
The substantially colorless polymeric multilayered film of claim 1 in which at least 70% of said light in the visible region of the spectrum is transmitted through said film.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-02 | 1997-02-01 | 1997-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-02 | 2001-02-01 | 2001-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-02 | 2005-02-01 | 2005-08-03 | $7700.00 | Window Closed / Lapsed |