US3948436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer bag
Assignee: Sealed Air Corp
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Filing: 1974-11-04
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Granted: 1976-04-06
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Expires: 1994-11-04
Abstract
Abstract A tear and puncture resistant and padded shipping bag is formed from a laminate including at least one layer of tear resistant, synthetic fibrous material, and at least one layer of synthetic foam padding. The fibrous material and the padding are secured together at contiguous faces by, for example, an intermediate thermoplastic layer bonded between the tear resistant and padding layers. The bag, so formed, is particularly appropriate for containing pointed or sharp edged objects.
Inventors
- 👤 John D. Bambara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:07
CPC Classifications
B; B32; B32B; B32B29/00; B32B29/002; B32B29/007; B65; B65D; B65D31/00; B65D31/02; B32B5/00; B32B5/22; B32B5/24; B32B5/245; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/025; B32B2307/00; B32B2307/50; B32B2307/582; B32B2307/5825; B32B2317/00; B32B2317/12; B32B2317/122; B32B2439/00; B32B2439/02; B32B2439/06; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24777; Y10T428/24785; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/249991; Y10T428/249992; Y10T428/249993
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
94 words
A padded and tear resistant bag having a bag body formed from at least one multilayer sheet, said sheet comprising a layer of tear resistant fibrous material having a resistance to tearing greatly exceeding that of paper, and a layer of synthetic foam material, the tear resistant and foam materials being joined together in said sheet over substantially the entire area of the body of said bag, whereby the foam provides cushioning to the bag body, increasing resistance to puncture from within, and enhances the tear resistance provided by the tear resistant fibrous layer.
Claim 2
Dependent Claim
94 words
A padded and tear resistant bag having a bag body formed from at least one multilayer sheet, said sheet comprising a layer of tear resistant fibrous material having a resistance to tearing greatly exceeding that of paper, and a layer of synthetic foam material, the tear resistant and foam materials being joined together in said sheet over substantially the entire area of the body of said bag, whereby the foam provides cushioning to the bag body, increasing resistance to puncture from within, and enhances the tear resistance provided by the tear resistant fibrous layer.
Claim 3
Dependent Claim
21 words
The bag according to claim 1 wherein said tear resistant fibrous material is synthetic plastic fibers joined in a nonwoven sheet.
Claim 4
Dependent Claim
52 words
The bag according to claim 2 wherein said foam is sponge-like and at least several times the thickness of said tear resistant sheet, whereby said foam deters firm gripping of the tear resistant sheet to further substantially increase the tear resistance of the multilayer sheet beyond that of the tear resistant layer.
Claim 5
Dependent Claim
12 words
The bag according to claim 3 wherein the foam is polyethylene foam.
Claim 6
Dependent Claim
33 words
The bag according to claim 1 wherein the layer of tear resistant material is disposed nearer the bag interior than said foam layer and is substantially more resistant to tearing than said foam.
Claim 7
Dependent Claim
51 words
The bag according to claim 5 wherein the at least one sheet further includes an outer layer of paper joined over substantially the area of the bag body with the layers of foam and tear resistant material, said tear resistant material being substantially more tear resistant than any other bag layer.
Claim 8
Dependent Claim
49 words
The bag according to claim 5 wherein the at least one sheet further includes a layer of synthetic plastic sheet material between said tear resistant layer and said foam layer and joining together said tear resistant layer and said foam layer over substantially the area of the bag body.
Claim 9
Dependent Claim
37 words
The bag according to claim 5, wherein the at least one sheet further includes an innermost layer of synthetic plastic material joined to remaining layers of the multilayer sheet over substantially the area of the bag body.
Claim 10
Dependent Claim
46 words
The bag according to claim 1 further including at least one closure flap, the closure flap including an extension of at least one of the layers of one multilayer sheet forming a side of the bag body, said flap being free of said tear resistant layer.
Claim 11
Dependent Claim
69 words
The bag according to claim 1 wherein each multilayer sheet forming the bag body includes an outer kraft layer cover adherent to said foam layer, a layer of synthetic plastic sheet affixed to the interior face of the foam layer and affixed to the outermost face of the tear resistant layer, and an innermost layer of synthetic plastic sheet affixed to the innermost face of the tear resistant layer.
Claim 12
Dependent Claim
86 words
A padded and tear resistant bag comprising at least one multilayer sheet including a first layer of tear resistant material of synthetic plastic fibers joined in a nonwoven sheet and a second layer of synthetic foam material much less resistant to tear than said tear resistant material, said tear resistant material and said foam combining to form a sheet substantially more resistant to manual tearing than said tear resistant sheet, said foam preventing manual folding of said tear resistant layer to a sharp, tear initiating fold.
Claim 13
Dependent Claim
86 words
A padded and tear resistant bag comprising at least one multilayer sheet including a first layer of tear resistant material of synthetic plastic fibers joined in a nonwoven sheet and a second layer of synthetic foam material much less resistant to tear than said tear resistant material, said tear resistant material and said foam combining to form a sheet substantially more resistant to manual tearing than said tear resistant sheet, said foam preventing manual folding of said tear resistant layer to a sharp, tear initiating fold.
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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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |