US4590124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storm window film
Assignee: Cryovac LLC
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Filing: 1984-05-10
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Granted: 1986-05-20
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Expires: 2004-05-10
Abstract
Abstract A three layered thermoplastic film having a desired combination of physical characteristics is disclosed. The film may be utilized to form storm windows. A preferred embodiment of the film comprises a core layer consisting essentially of a linear low density polyethylene and two surface layers comprising a four component blend of (1) a linear low density polyethylene, (2) a linear medium density polyethylene (3) a copolymer of ethylene and vinyl acetate and (4) one or more light stabilizers.
Inventors
- 👤 Julian H. Schoenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:51
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/269; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2848; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
55 words
An oriented multi-layer film comprising: a cross-linked core layer consisting essentially of a linear low density polyethylene; and two cross-linked surface layers each comprising a four component blend of (1) a linear low density polyethylene, (2) a linear medium density polyethylene, (3) an ethylene vinyl acetate copolymer and (4) at least one ultraviolet light stabilizer.
Claim 2
Dependent Claim
55 words
An oriented multi-layer film comprising: a cross-linked core layer consisting essentially of a linear low density polyethylene; and two cross-linked surface layers each comprising a four component blend of (1) a linear low density polyethylene, (2) a linear medium density polyethylene, (3) an ethylene vinyl acetate copolymer and (4) at least one ultraviolet light stabilizer.
Claim 3
Dependent Claim
99 words
An oriented three-layer film adapted for use as a storm window comprising: a cross-linked core layer consisting essentially of a linear low density polyethylene; two cross-linked surface layers each comprising a four component blend of (1) from about 40% to about 60%, by weight, of a linear low density polyethylene, (2) from about 20% to about 30%, by weight, of a linear medium density polyethylene, (3) from about 20% to about 30%, by weight, of an ethylene vinyl acetate copolymer, and (4) from about 500 ppm to about 3000 ppm of at least one hindered amine ultraviolet light stabilizer.
Claim 4
Dependent Claim
99 words
An oriented three-layer film adapted for use as a storm window comprising: a cross-linked core layer consisting essentially of a linear low density polyethylene; two cross-linked surface layers each comprising a four component blend of (1) from about 40% to about 60%, by weight, of a linear low density polyethylene, (2) from about 20% to about 30%, by weight, of a linear medium density polyethylene, (3) from about 20% to about 30%, by weight, of an ethylene vinyl acetate copolymer, and (4) from about 500 ppm to about 3000 ppm of at least one hindered amine ultraviolet light stabilizer.
Claim 5
Dependent Claim
143 words
An oriented three layer film adapted for use as a storm window comprising: a cross-linked core layer consisting essentially of a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter; and two cross-linked surface layers each consisting essentially of a four component blend of (1) about 50%, by weight, of a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter, (2) about 25%, by weight, of a linear medium density polyethylene having a density of about 0.935 grams per cubic centimeter, (3) about 25%, by weight, of an ethylene vinyl acetate copolymer comprising from about 3.3% to about 4.1% vinyl acetate derived units, said copolymer having a density of from about 0.9232 to about 0.9250 grams per cubic centimeter and (4) about 1,500 parts per million of a hindered amine ultraviolet light stabilizer.
Claim 6
Dependent Claim
143 words
An oriented three layer film adapted for use as a storm window comprising: a cross-linked core layer consisting essentially of a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter; and two cross-linked surface layers each consisting essentially of a four component blend of (1) about 50%, by weight, of a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter, (2) about 25%, by weight, of a linear medium density polyethylene having a density of about 0.935 grams per cubic centimeter, (3) about 25%, by weight, of an ethylene vinyl acetate copolymer comprising from about 3.3% to about 4.1% vinyl acetate derived units, said copolymer having a density of from about 0.9232 to about 0.9250 grams per cubic centimeter and (4) about 1,500 parts per million of a hindered amine ultraviolet light stabilizer.
Claim 7
Dependent Claim
20 words
The film of claim 1 comprising from about 500 to about 3,000 parts per million of said ultraviolet light stabilizer.
Claim 8
Dependent Claim
19 words
The film of claim 1 comprising about 1,000 to about 2,000 parts per million of said ultraviolet light stabilizer.
Claim 9
Dependent Claim
16 words
The film of claim 1 comprising about 1,500 parts per million of said ultraviolet light stabilizer.
Claim 10
Dependent Claim
27 words
The film of claim 2 wherein said ethylene vinyl acetate copolymer comprises from about 2%, by weight, to about 18%, by weight, of vinyl acetate derived units.
Claim 11
Dependent Claim
26 words
The film of claim 2 wherein said vinyl aceate copolymer comprises from about 2%, by weight, to about 10%, by weight, of vinyl acetate derived units.
Claim 12
Dependent Claim
27 words
The film of claim 2 wherein said ethylene vinyl acetate copolymer comprises from about 2%, by weight, to about 5%, by weight, of vinyl acetate derived units.
Claim 13
Dependent Claim
21 words
The film of claim 2 comprising from about 1,000 to about 2,000 part per million of hindered amine ultraviolet light stabilizer.
Claim 14
Dependent Claim
17 words
The film of claim 2 comprising about 1,500 parts per million of hindered amine ultraviolet light stabilizers.
Claim 15
Dependent Claim
19 words
The film of claims 2 or 3 further comprising a colorant additive to at least one of said layers.
Claim 16
Dependent Claim
17 words
The film of claims 2 or 3 further comprising a colorant additive solely in said core layer.
Claim 17
Dependent Claim
22 words
The film of claims 2 or 3 which has been cross-linked with from about 3 MR to about 8 MR of irradiation.
Claim 18
Dependent Claim
22 words
The film of claims 2 or 3 which has been cross-linked with from about 5 MR to about 7 MR of irradiation.
Claim 19
Dependent Claim
17 words
The film of claims 2 or 3 which has been cross-linked with about 6 MR of irradiation.
Claim 20
Dependent Claim
31 words
The film of claims 2 or 3 which has been oriented by racking at a racking ratio of from about 3.0 to about 4.0 in both the longitudinal and transverse directions.
Claim 21
Dependent Claim
31 words
The film of claims 2 or 3 which has been oriented by racking at a racking ratio of from about 3.0 to about 3.5 in both the longitudinal and transverse directions.
Claim 22
Dependent Claim
27 words
The film of claims 2 or 3 which have been oriented by racking at a racking ratio of about 3.3 in both the longitudinal and transverse directions.
Claim 23
Dependent Claim
34 words
The film of claims 2 or 3 which has an average longitudinal elongation at break and 73° F. of about 221% and an average transverse elongation at break and 73° F. of about 226%.
Claim 24
Dependent Claim
32 words
The film of claims 2 or 3 which has an average longitudinal tear propagation at 73° F. of about 29.13 and an average transverse tear propagation at 73° F. of about 30.38.
Claim 25
Dependent Claim
26 words
The film of claims 2 or 3 which has an average ball burst impact at 73° F., 1.00 inch diameter sphere head of about 37.3 centimeters×killograms.
References Cited (Backward Citations)
US4076698B1
Cited
US4076698A
Cited
US4399180A
Cited
US4354997A
Cited
US4421867A
Cited
US4424243A
Cited
US4425268A
Cited
US4438228A
Cited
US4362835A
Cited
US4449014A
Cited
US4438238A
Cited
US4387188A
Cited
US4412025A
Cited
US4360494A
Cited
US4440911A
Cited
US4426498A
Cited
US4430289A
Cited
US4356221A
Cited
US4419473A
Cited
US4415707A
Cited
US4425044A
Cited
US4397982A
Cited
US4402409A
Cited
US4379197A
Cited
US4409364A
Cited
US4363841A
Cited
US4426029A
Cited
US4399173A
Cited
US4434258A
Cited
US4444828A
Cited
US4430476A
Cited
US4420580A
Cited
US4416944A
Cited
US4410649A
Cited
US4394485A
Cited
US4403053A
Cited
US4430457A
Cited
US4430477A
Cited
US4444827A
Cited
US4410587A
Cited
US4438850A
Cited
US4430468A
Cited
US4407874A
Cited
US4424256A
Cited
US4405667A
Cited
US4407873A
Cited
US4445550B1
Cited
US4445550A
Cited
US4436888A
Cited
US4448913A
Cited
US4418841A
Cited
US4447480A
Cited
US4434264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |