Patent US4838648A successfully refreshed from Google Patents.
US4838648A
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US
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Thin film structure having magnetic and color shifting properties
Assignee: Viavi Solutions Inc
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Filing: 1988-05-03
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Granted: 1989-06-13
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Expires: 2008-05-03
Abstract
Abstract The disclosure relates to a thin film structure having magnetic and optical variable properties comprising a substrate (12) and a multilayer interference coating (16) carried by the substrate producing an inherent colour shift with angle. The interference coating has a metal-dielectric design which includes a metal (17) which has reflective as well as magnetic properties.
Inventors
- 👤 Roger W. Phillips
- 👤 Paul G. Coombs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:00
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/285; C; C09; C09C; C09C1/00; C09C1/0015; G06; G06K; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G11; G11B; G11B7/00; G11B7/24; C01; C01P; C01P2006/00; C01P2006/42; Y; Y10; Y10S; Y10S283/00; Y10S283/902
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
49 words
In a thin film structure having magnetic properties and optically variable properties, a substrate and a multilayer interference coating carried by the substrate producing an inherent color shift with angle, said interference coating having a metal-dielectric design which includes a metal which has magnetic as well as reflective properties.
Claim 2
Dependent Claim
49 words
In a thin film structure having magnetic properties and optically variable properties, a substrate and a multilayer interference coating carried by the substrate producing an inherent color shift with angle, said interference coating having a metal-dielectric design which includes a metal which has magnetic as well as reflective properties.
Claim 3
Dependent Claim
19 words
A structure as in claim 1 wherein said metal having reflecting and magnetic properties is a cobalt nickel alloy.
Claim 4
Dependent Claim
32 words
A structure as in claim 2 wherein said cobalt nickel alloy is a composition of 80% cobalt and 20% nickel by weight plus or minus 10% for each metal in the alloy.
Claim 5
Dependent Claim
72 words
A structure as in claim 1 together with subtractive colorant means external of the multilayer interference coating on the side of the multilayer interference coating facing the incident light, said subtractive colorant means in combination with a multilayer interference coating serving to modify the inherent color shift produced by the multilayer interference coating to provide a discrete color shift from one distinct color to another color at two different angles of incidence.
Claim 6
Dependent Claim
19 words
A structure as in claim 1 wherein said subtractive colorant means is in the form of a dyed superstrate.
Claim 7
Dependent Claim
19 words
A structure as in claim 1 together with a release layer disposed between the interference coating and the substrate.
Claim 8
Dependent Claim
22 words
A structure as in claim 6 together with an adhesive carried by the interference coating, said adhesive being exposed to the ambient.
Claim 9
Dependent Claim
23 words
A structure as in claim 7 wherein said metallic layer having highly reflecting and magnetic properties is comprised of a cobalt nickel alloy.
Claim 10
Dependent Claim
23 words
A structure in claim 6 together with subtractive colorant means carried by each of the opposite sides of the symmetrical multilayer interference coating.
Claim 11
Dependent Claim
75 words
In a thin film structure having substantial color shift with angle of light incidence and viewing, a symmetrical multilayer interference coating producing an inherent color shift with angle, said symmetrical multilayer interference coating being a metal layer formed of a metal which is highly reflecting and which has magnetic properties and a dielectric layer disposed on opposite sides of the metal layer and a metallic absorber layer disposed on each of the dielectric spacer layers.
Claim 12
Dependent Claim
75 words
In a thin film structure having substantial color shift with angle of light incidence and viewing, a symmetrical multilayer interference coating producing an inherent color shift with angle, said symmetrical multilayer interference coating being a metal layer formed of a metal which is highly reflecting and which has magnetic properties and a dielectric layer disposed on opposite sides of the metal layer and a metallic absorber layer disposed on each of the dielectric spacer layers.
Claim 13
Dependent Claim
34 words
A structure as in claim 10 wherein said cobalt nickel alloy has a composition of approximately 80-20% by weight respectively of cobalt and nickel plus or minus 10% for each metal in the alloy.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |