USRE31780E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer light-reflecting film
Assignee: Mearl Corp
•
Filing: 1983-08-08
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Granted: 1984-12-25
•
Expires: 2003-08-08
Abstract
Abstract Improvements in multilayer light-reflecting film are effected by the use of thermoplastic polyester as the high refractive index component of a system in which two or more resinous materials form a plurality of layers.
Inventors
- 👤 Scott A. Cooper
- 👤 Ramakrishna Shetty
- 👤 Jules Pinsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:53
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/285; G02B5/287; B; B32; B32B; B32B7/00; B32B7/02; B32B7/023; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
80 words
A transparent thermoplastic resinous laminate film of at least 10 very thin layers of substantially uniform thickness, said layers being generally parallel, the contiguous adjacent layers being of different transparent thermoplastic resinous materials one of which is a .Iadd.terephthalate .Iaddend.thermoplastic polyester or copolyester resin having a refractive index of 1.55-1.61 and the adjacent resinous material having a refractive index which is lower by at least about 0.03, the contiguous adjacent layers differing in refractive index by at least about 0.03.
Claim 2
Dependent Claim
80 words
A transparent thermoplastic resinous laminate film of at least 10 very thin layers of substantially uniform thickness, said layers being generally parallel, the contiguous adjacent layers being of different transparent thermoplastic resinous materials one of which is a .Iadd.terephthalate .Iaddend.thermoplastic polyester or copolyester resin having a refractive index of 1.55-1.61 and the adjacent resinous material having a refractive index which is lower by at least about 0.03, the contiguous adjacent layers differing in refractive index by at least about 0.03.
Claim 3
Dependent Claim
34 words
The transparent thermoplastic resinous laminate film of claim 1, wherein said polyester or copolyester is selected from the group consisting of poly(ethylene terephthalate), and a copolyester of cyclohexanedimethanol and an acid comprising terephthalate acid.
Claim 4
Dependent Claim
14 words
The transparent thermoplastic resinous laminate film of claim 1 having at least 35 layers.
Claim 5
Dependent Claim
15 words
The transparent thermoplastic resinous laminate film of claim 3 having at least about 70 layers.
Claim 6
Dependent Claim
26 words
The transparent thermoplastic resinous laminate film of claim 4 wherein said adjacent resinous material has a refractive index which is lower by at least about 0.06.
Claim 7
Dependent Claim
15 words
The transparent thermoplastic resinous laminate film of claim 1, wherein said polyester is polybutylene terephthalate.
Claim 8
Dependent Claim
17 words
The transparent thermoplastic resinous laminate film of claim 6, wherein said other resinous material is polymethyl methacrylate.
Claim 9
Dependent Claim
42 words
The transparent thermoplastic resinous laminate film of claim 1 wherein the outermost layers of said film comprise an impact modified acrylic resin and the thickness of each of the outermost layers is at least 5% of the total thickness of the film.
Claim 10
Dependent Claim
31 words
The transparent thermoplastic resinous laminate film of claim 8 wherein said impact modified acrylic resin is a terpolymer of methyl methacrylate, butadiene and acrylonitrile, or methyl methacrylate combined with an elastomer.
Claim 11
Dependent Claim
25 words
The transparent thermoplastic resinous laminate film of claim 9 wherein said polyester or copolyester resin is polybutylene terephthlate and adjacent other resin is polymethyl methacrylate.
Claim 12
Dependent Claim
17 words
The transparent thermoplastic resinous laminate film of claim 10 of at least 70 substantially uniformly thick layers.
References Cited (Backward Citations)
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Cited
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Cited
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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) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |