US4079851A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite plastic container
Assignee: National Can Corp
•
Filing: 1976-08-30
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Granted: 1978-03-21
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Expires: 1996-08-30
Abstract
Abstract Composite plastic containers and method for making the same in which a preformed sleeve is caused to expand with a plastic layer in the course of an injection blow molding operation and to adhere, upon expansion, to said plastic layer due to atmospheric pressure acting on the inside of said sleeve without an opposing pressure on the outside thereof.
Inventors
- 👤 Emery I. Valyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:04
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/14; B29C2949/00; B29C2949/30; B29C2949/3008; B29C2949/3012; B29C2949/3016; B29C2949/302; B29C2949/3024; B29C2949/3026; B29C2949/3032; B29C2949/3064; B29L; B29L2031/00; B29L2031/712; B29L2031/7158; B29L2031/716
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
126 words
An open necked composite plastic container having at least two layers of plastic material with different properties, including an outer layer and an inner layer with the inner layer under compression by the outer layer, said layers being in intimate surface contact and having no air space therebetween, whereby said layers are maintained in surface contact by the ambient air pressure and wherein the total shrinkage of the outer layer is greater than that of the inner layer, in which said layers have been expanded together from parison form into the form of a finished article, wherein the inner layer has a flange adjacent the open neck at least partially covering the outer layer, with said flange sealing against the entry of air between said layers.
Claim 2
Dependent Claim
126 words
An open necked composite plastic container having at least two layers of plastic material with different properties, including an outer layer and an inner layer with the inner layer under compression by the outer layer, said layers being in intimate surface contact and having no air space therebetween, whereby said layers are maintained in surface contact by the ambient air pressure and wherein the total shrinkage of the outer layer is greater than that of the inner layer, in which said layers have been expanded together from parison form into the form of a finished article, wherein the inner layer has a flange adjacent the open neck at least partially covering the outer layer, with said flange sealing against the entry of air between said layers.
Claim 3
Dependent Claim
20 words
A container according to claim 1 wherein said flange includes a downwardly extending lip portion embedded in the outer layer.
Claim 4
Dependent Claim
41 words
A container according to claim 1 in which the inner layer is sealed to the outer layer adjacent the open neck so as to prevent displacement of the inner layer by the entrance of air between the inner and outer layers.
Claim 5
Dependent Claim
13 words
A container according to claim 1 wherein the outer layer is pressure molded.
Claim 6
Dependent Claim
20 words
A container according to claim 1 wherein the outer layer is selected from the group consisting of polyethylene and polystyrene.
Claim 7
Dependent Claim
23 words
A container according to claim 1 in which the inner layer is selected from the group consisting of acrylonitrrile, polyvinylidene chloride and polyethylene.
Claim 8
Dependent Claim
21 words
A container according to claim 1 wherein the thermal expansion coefficient of the inner layer exceeds that of the outer layer.
Claim 9
Dependent Claim
99 words
An open necked composite plastic container having at least two layers of plastic material with different properties, including an outer layer and an inner layer, said layers being in intimate surface contact and having no air space therebetween, whereby said layers are maintained in surface contact by the ambient air pressure, in which said layers have been expanded together from parison form into the form of a finished article, wherein the inner layer has a flange adjacent the open neck at least partially covering the outer layer, with said flange sealing against the entry of air between said layers.
Claim 10
Dependent Claim
99 words
An open necked composite plastic container having at least two layers of plastic material with different properties, including an outer layer and an inner layer, said layers being in intimate surface contact and having no air space therebetween, whereby said layers are maintained in surface contact by the ambient air pressure, in which said layers have been expanded together from parison form into the form of a finished article, wherein the inner layer has a flange adjacent the open neck at least partially covering the outer layer, with said flange sealing against the entry of air between said layers.
References Cited (Backward Citations)
US2781551A
Cited
US3140004A
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US3144167A
Cited
US3247550A
Cited
US3409710A
Cited
US3869056A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |