Patent US4292355A successfully refreshed from Google Patents.
US4292355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moisture-impervious coextruded container
Assignee: Portage Industries Corp
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Filing: 1979-06-18
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Granted: 1981-09-29
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Expires: 1999-06-18
Abstract
Abstract A moisture-impervious plastic container thermally formed from a coextruded sheet including a layer of polypropylene directly adhered to a layer of butadiene-styrene polymer.
Inventors
- 👤 Laszlo J. Bonis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:09
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B7/00; B32B7/04; B32B7/12; B32B2307/00; B32B2307/40; B32B2307/402; B32B2307/70; B32B2307/726; B32B2307/7265; B32B2439/00; B32B2439/02; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/31924
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
100 words
A moisture impervious plastic container, with a wall comprising a layer of polypropylene and a layer of butadiene-styrene polymer directly adhered by coextrusion, without an intervening layer, to said polypropylene layer, neither of said layers containing any adhesive material mixed therewith for the purpose of adhering said layers together, adhesion between said layers being provided solely by interaction between said polypropylene and butadiene-styrene polymer, said polypropylene layer being sufficiently thick to provide a moisture barrier in said wall, and said butadiene-styrene polymer layer being sufficiently thick to permit thermoforming of said container from a sheet comprised of said two layers.
Claim 2
Dependent Claim
100 words
A moisture impervious plastic container, with a wall comprising a layer of polypropylene and a layer of butadiene-styrene polymer directly adhered by coextrusion, without an intervening layer, to said polypropylene layer, neither of said layers containing any adhesive material mixed therewith for the purpose of adhering said layers together, adhesion between said layers being provided solely by interaction between said polypropylene and butadiene-styrene polymer, said polypropylene layer being sufficiently thick to provide a moisture barrier in said wall, and said butadiene-styrene polymer layer being sufficiently thick to permit thermoforming of said container from a sheet comprised of said two layers.
Claim 3
Dependent Claim
96 words
A coextruded, moisture-impervious sheet suitable for thermoforming into containers, comprising a layer of polypropylene and a layer of butadiene-styrene polymer directly adhered by coextrusion, without an intervening layer, to said polypropylene layer, neither of said layers containing any adhesive material mixed therewith for the purpose of adhering said layers together, adhesion between said layers being provided solely by interaction between said polypropylene and butadiene-styrene polymer, said polypropylene layer being sufficiently thick to provide a moisture barrier in said wall, and said butadiene-styrene polymer layer being sufficiently thick to permit thermoforming of a container from said sheet.
Claim 4
Dependent Claim
96 words
A coextruded, moisture-impervious sheet suitable for thermoforming into containers, comprising a layer of polypropylene and a layer of butadiene-styrene polymer directly adhered by coextrusion, without an intervening layer, to said polypropylene layer, neither of said layers containing any adhesive material mixed therewith for the purpose of adhering said layers together, adhesion between said layers being provided solely by interaction between said polypropylene and butadiene-styrene polymer, said polypropylene layer being sufficiently thick to provide a moisture barrier in said wall, and said butadiene-styrene polymer layer being sufficiently thick to permit thermoforming of a container from said sheet.
Claim 5
Dependent Claim
12 words
The container of claim 1 wherein one of said layers is colored.
Claim 6
Dependent Claim
19 words
The container of claim 1 said polypropylene layer is more than twice the thickness of said butadiene-styrene polymer layer.
Claim 7
Dependent Claim
28 words
The structure according to claims 1 or 2 further comprising another layer of butadiene-styrene polymer separated by said layer of polypropylene from said first-mentioned layer of butadiene-styrene polymer
Claim 8
Dependent Claim
27 words
The structure according to claims 1 or 2 further comprising another layer of polypropylene separated by said layer of butadiene-styrene polymer from said first-mentioned layer of polypropylene.
Claim 9
Dependent Claim
19 words
The structure according to claims 1 or 2 wherein said butadiene-styrene polymer layer comprises 100 percent butadiene-styrene polymer resin.
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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) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |