Patent US3743172A successfully refreshed from Google Patents.
US3743172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quilted laminar films comprising at least two layers of dissimilar material
Assignee: Mobil Oil AS
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Filing: 1971-03-23
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Granted: 1973-07-03
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Expires: 1991-03-23
Abstract
Abstract A quilted laminar film structure comprising two layers of dissimilar thermoplastic, for example, one layer of low-density polyethylene and another layer of high-density polyethylene which are heat sealed together along a plurality of intersecting heat seal lines. Such laminar materials are adapted for employment as over wrap packaging materials, thermoplastic bag structures and, in particular, thermoplastic bags characterized by having a specific square bottom configuration.
Inventors
- 👤 K Ackley
- 👤 A Sparks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:33
CPC Classifications
B; B65; B65D; B65D75/00; B65D75/008; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/24; Y10T428/24355; Y10T428/24628; Y10T428/24669; Y10T428/24678
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
109 words
A double walled, thermoplastic bag structure formed of a flattened tube, the walls of said tube being made of a thermoplastic laminate, said laminate comprising a layer (60) of low-density polyethylene; a layer (62) of high-density polyethylene, whereby said layers, individually, will have dissimilar physical properties regarding tensile modulus, tensile strength, and tear resistance; said two layers (60, 62) being heat bonded together along a plurality of intersecting heat seal lines (61) between which air is entrapped to form air pockets (63), said heat seal line (61) being arranged with respect to the bag such that they are no seal lines extending uninterruptedly transversely with respect to the bag.
Claim 2
Dependent Claim
37 words
A bag structure according to claim 2 wherein the inner layer (60) of the bag is of low-density, high tear strength polyethylene and outer layer (62) is of high density, high tensile modulus and tensile strength polyethylene.
Claim 3
Dependent Claim
30 words
A bag structure according to claim 2 wherein the inner layer (60) of the bag is smooth and the outer layer (62) of the bag presents a quilted, embossed appearance.
References Cited (Backward Citations)
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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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |