Patent US4444827A successfully refreshed from Google Patents.
US4444827A
Expired / Lapsed
US
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Opaque laminate sheet structure
Assignee: Ludlow Corp
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Filing: 1982-06-24
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Granted: 1984-04-24
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Expires: 2002-06-24
Abstract
Abstract An improved, tough, opaque laminate structure, particularly useful for incorporation into packaging for light-sensitive photographic products. The laminate comprises a polyisobutylene-modified, high-density polyethylene layer which is sandwiched between two layers of linear low density or linear medium density polyethylene.
Inventors
- 👤 Nareshwar Swaroop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:14
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/322; G; G03; G03C; G03C3/00; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/30; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
85 words
An opaque laminate sheet structure free of cross-lamination structure and comprising a rubber-modified polyolefin layer sandwiched between two carbon-black bearing layers of linear low density, or linear medium density, polyethylene wherein each layer of linear, low density polyethylene or linear, medium density polyethylene is laminated to said rubber-modified polyethylene with a coating of a laminating resin selected from the group of a low density polyethylene, a copolymer of polyethylene with vinyl acetate or acrylic acid, a two component thermosetting adhesive and a medium density polyethylene.
Claim 2
Dependent Claim
85 words
An opaque laminate sheet structure free of cross-lamination structure and comprising a rubber-modified polyolefin layer sandwiched between two carbon-black bearing layers of linear low density, or linear medium density, polyethylene wherein each layer of linear, low density polyethylene or linear, medium density polyethylene is laminated to said rubber-modified polyethylene with a coating of a laminating resin selected from the group of a low density polyethylene, a copolymer of polyethylene with vinyl acetate or acrylic acid, a two component thermosetting adhesive and a medium density polyethylene.
Claim 3
Dependent Claim
29 words
An opaque laminate as defined in claim 1, wherein said laminating resin is low density polyethylene or a copolymer of low density polyethylene with vinyl acetate or acrylic acid.
Claim 4
Dependent Claim
16 words
An opaque laminate as defined in claim 1, wherein said laminating resin is medium density polyethylene.
Claim 5
Dependent Claim
19 words
A laminate as defined in claims 1, 2 or 3 wherein said rubber-modified polyolefin layer is polyisobutylene-modified, high-density polyethylene.
Claim 6
Dependent Claim
51 words
A laminate as defined in claims 1, 2, or 3 wherein said rubber-modified layer is from about 0.0018 to about 0.003 inches thick; wherein said laminating resin layers are from about 0.0005 to about 0.00075 inches thick; and wherein said linear low-density polyethylene is about 0.001 to about 0.002 inches thick.
Claim 7
Dependent Claim
61 words
A laminate as defined in claims 1, 2 or 3 wherein said rubber-modified polyolefin layer is polyisobutylene-modified, high-density polyethylene of from about 0.0018 to about 0.003 inches thick; wherein said laminating resin layers are from about 0.0005 to about 0.00075 inches thick; wherein said linear low density, or said linear medium density, polyethylene is about 0.001 to about 0.002 inches thick.
Claim 8
Dependent Claim
51 words
A laminate as defined in claim 6, about 0.007 inches thick and having the following properties: ______________________________________
Opacity 99.95 percent of light
will not be transmitted
Tensile strength 15 lbs per unit
Minimum elongation 400 percent
Minimum tear strength
500 grams
Minimum stiffness 130 mg
Impact value 80 or more.
______________________________________
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) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |