US4160053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blocked film laminate of low density polyethylene
Assignee: Pactiv LLC
•
Filing: 1977-11-17
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Granted: 1979-07-03
•
Expires: 1997-11-17
Abstract
Abstract Laminates of two or more low density polyethylene films are prepared by blocking together superimposed films at a temperature below the fusion temperature, whereby the films can be pealed apart without distortion. The laminates are adapted for the manufacture of heavy duty bags and sacks having increased impact and tear resistance, as compared with single films or fused together laminates having the same gauge.
Inventors
- 👤 William J. Clayton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:49
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B1/00; B32B1/08; B32B27/18; B32B27/20; B32B7/00; B32B7/04; B32B7/06; B32B2307/00; B32B2307/40; B32B2307/402; B32B2307/4026; B32B2307/50; B32B2307/514; B32B2307/70; B32B2307/748; B32B2323/00; B32B2323/04; B32B2323/046; B32B2439/00; B32B2439/02; B32B2439/06; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/25; Y10T428/31; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
30 words
A laminate of at least two low density polyethylene films blocked together at a temperature between about 80° C. and 100° C. and below the fusion temperature of the polyethylene.
Claim 2
Dependent Claim
30 words
A laminate of at least two low density polyethylene films blocked together at a temperature between about 80° C. and 100° C. and below the fusion temperature of the polyethylene.
Claim 3
Dependent Claim
10 words
The laminate of claim 1 wherein said films are pigmented.
Claim 4
Dependent Claim
12 words
The laminate of claim 1 wherein said films are in ±15° orientation.
Claim 5
Dependent Claim
12 words
Heavy duty bags and sacks made from the laminate of claim 1.
Claim 6
Dependent Claim
12 words
Heavy duty bags and sacks made from the laminate of claim 2.
Claim 7
Dependent Claim
12 words
Heavy duty bags and sacks made from the laminate of claim 3.
References Cited (Backward Citations)
US3058863A
Cited
US3361607A
Cited
US3582418A
Cited
US3509005A
Cited
US3554833A
Cited
US3950206A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-02 | 1983-01-01 | 1983-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-02 | 1987-01-01 | 1987-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-02 | 1991-01-01 | 1991-07-03 | $7700.00 | Window Closed / Lapsed |