US4810541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic container having a surface to which a lid may be peelably sealed
Assignee: PLASTIC PACKAGING PRODUCTS Co A CORP OF DELAWARE
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Filing: 1987-11-27
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Granted: 1989-03-07
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Expires: 2007-11-27
Abstract
Abstract A plastic container adapted to be peelably heat sealed with a lid, the container having an integral peripheral flange extending outwardly from its upper edge to which the lid may be peelably heat sealed, the lid contacting surface of the flange being comprised of a peel mixture of polyethylene, and ethylene/vinyl acetate copolymer and a butene-1 polymer.
Inventors
- 👤 Frederick C. Newman
- 👤 Louis J. Marsella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:28
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B65; B65D; B65D2577/00; B65D2577/10; B65D2577/20; B65D2577/2025; B65D2577/2041; B65D2577/205; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/24; Y10T428/24777; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/3192; Y10T428/31924
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
110 words
A plastic container adapted to be peelably heat sealed with a lid, the container having an integral peripheral flange extending outwardly from its upper edge to which a lid may be peelably heat sealed, the lid contacting surface of the flange being comprised of a peel mixture of (1) about 40 to about 60 percent by weight polyethylene, (2) about 30 to about 45 percent by weight of a copolymer of ethylene and vinyl acetate containing about 80 to about 98 percent by weight ethylene and about 2.0 to about 20.0 percent by weight vinyl acetate and (3) about 8 to about 28 percent by weight of a butene-1 polymer.
Claim 2
Dependent Claim
110 words
A plastic container adapted to be peelably heat sealed with a lid, the container having an integral peripheral flange extending outwardly from its upper edge to which a lid may be peelably heat sealed, the lid contacting surface of the flange being comprised of a peel mixture of (1) about 40 to about 60 percent by weight polyethylene, (2) about 30 to about 45 percent by weight of a copolymer of ethylene and vinyl acetate containing about 80 to about 98 percent by weight ethylene and about 2.0 to about 20.0 percent by weight vinyl acetate and (3) about 8 to about 28 percent by weight of a butene-1 polymer.
Claim 3
Dependent Claim
37 words
The container of claim 1 wherein there is incorporated in the butene-1 polymer about 0.05 to about 0.15 percent by weight of antiblock additive and about 0.1 to about 0.5 percent by weight of a slip additive.
Claim 4
Dependent Claim
11 words
The container of claim 2 wherein the antiblock additive is silica.
Claim 5
Dependent Claim
13 words
The container of claim 2 wherein the slip additive is a primary amide.
Claim 6
Dependent Claim
12 words
The container of claim 3 wherein the primary amide is an oleamide.
Claim 7
Dependent Claim
47 words
The container of claim 1 wherein the peel mixture is comprised of about 45 to about 55 percent by weight polyethylene, about 35 to about 42 percent by weight of the ethylene/vinyl acetate copolymer and about 8 to about 20 percent by weight of the butene-1 polymer.
Claim 8
Dependent Claim
70 words
The container of claim 1 wherein the container is formed from a multilayer sheet comprised of an inner gas barrier core layer, a polyethylene layer bonded to one surface of the barrier layer, a high impact polystyrene layer bonded to the other surface of the barrier layer and a layer of the peel composition bonded to the polyethylene layer, the peel composition layer forming the interior surface of the container.
Claim 9
Dependent Claim
14 words
The container of claim 7 wherein the barrier layer is a vinylidene chloride polymer.
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) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |