US3655503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Package of composite film with peelable, heatsealable surfaces
Assignee: Fort James Corp
•
Filing: 1969-01-13
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Granted: 1972-04-11
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Expires: 1989-01-13
Abstract
Abstract A package comprised of a composite, peelable, heatsealable thermoplastic film having at least two layers, said film having a heatseal strength of less than about 1.0 pound per inch width. The low heatseal strength is achieved by an outer thermoplastic layer having a caliper of less than about 0.4 mil, the outer layer being characterized in having a tensile strength of less than about 10,000 psi and having an interlaminar steel strength of the outer layer to the molecularly different other layer of less than about 1.0 pound per inch width. Numerous combinations of thermoplastics may be employed for the outer and other layers.
Inventors
- 👤 Hugh E Stanley
- 👤 George M Tokos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:33
CPC Classifications
F; F16; F16K; F16K51/00; B; B32; B32B; B32B27/00; B65; B65D; B65D75/00; B65D75/26; F16K19/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24612; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
21 words
The package of claim 1. wherein the polyethylene layer is selected from the group consisting of low and medium density polyethylenes.
Claim 2
Dependent Claim
151 words
An easy opening package comprising a single sheet of composite thermoplastic film overlapped about itself and containing at least one heatseal zone located in the overlapped portion, said composite thermoplastic film comprising three thermoplastic layers, the inner layer being polypropylene and the outer layers being polyethylene, said outer layers having an individual thickness less than about 0.4 mil and a tensile strength of less than about 10,000 psi, the interlaminar bond strength between the polyethylene layers and the polypropylene layer being between about 0.1 to 1.0 lb./inch width; said heatseal in the overlapped portion being a polyethylene to polyethylene heatseal; said package being easily opened upon pulling apart said heatseal by application of a relatively small opening force of less than about 1.0 lb./inch width whereby delamination occurs between the heatsealed polyethylene layer and said polypropylene layer, and the heatsealed polyethylene layer is ruptured at the edges of the heatseal zone.
Claim 3
Dependent Claim
21 words
The package of claim 3 wherein the polyethylene layer is selected from the group consisting of low and medium density polyethylenes.
References Cited (Backward Citations)
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US3329549A
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US3338739A
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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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |