US4399173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer films comprising low pressure, low density polyethylene
Assignee: Glad Products Co
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Filing: 1982-01-04
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Granted: 1983-08-16
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Expires: 2002-01-04
Abstract
Abstract A multilayer plastic film free of melt fracture suitable for use in packaging and making bags wherein the film comprises a core layer of low melt index, low pressure, low density polyethylene, and two outer layers of a high melt index, low pressure, low density polyethylene. The process of making the multilayer film is also disclosed.
Inventors
- 👤 John Anthony
- 👤 Stuart J. Kurtz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:40
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B2323/00; B32B2323/04; B32B2323/046; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
74 words
A multilayer film free of melt fracture comprising a core layer of low melt index, low pressure, low density polyethylene between two outer layers of a high melt index, low pressure, low density polyethylene said low melt index polyethylene having a melt index of between about 0.2 decigrams per minute and about 3.0 decigrams per minute, and said high melt index polyethylene having a melt index of greater than about 3.0 decigrams per minute.
Claim 2
Dependent Claim
74 words
A multilayer film free of melt fracture comprising a core layer of low melt index, low pressure, low density polyethylene between two outer layers of a high melt index, low pressure, low density polyethylene said low melt index polyethylene having a melt index of between about 0.2 decigrams per minute and about 3.0 decigrams per minute, and said high melt index polyethylene having a melt index of greater than about 3.0 decigrams per minute.
Claim 3
Dependent Claim
28 words
A multilayer film as in claim 1 wherein said core layer of said polyethylene has a melt index of between about 0.2 and about 2.0 decigrams per minute.
Claim 4
Dependent Claim
31 words
A multilayer film as in claim 1 wherein said outer layers of said polyethylene have a melt index of between about 5.0 decigrams per minute and about 20.0 decigrams per minute.
Claim 5
Dependent Claim
22 words
A multilayer film as in claim 1 wherein the thickness of said film is between about 1 mil and about 3 mils.
Claim 6
Dependent Claim
21 words
A multilayer film as in claim 4 wherein the thickness of said film is between about 1.3 and about 1.8 mils.
Claim 7
Dependent Claim
28 words
A multilayer film as in claim 1 wherein the ratio of thicknesses between said core layer and said two outer layers is on the order of about 1:5:1.
Claim 8
Dependent Claim
15 words
A multilayer film as in claim 1 wherein said film contains at least one colorant.
Claim 9
Dependent Claim
15 words
A multilayer film as in claim 1 wherein said film is formed into a bag.
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) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |