Patent US3955697A successfully refreshed from Google Patents.
US3955697A
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US
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Multilayered hollow plastic container
Assignee: National Can Corp
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Filing: 1975-01-06
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Granted: 1976-05-11
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Expires: 1995-01-06
Abstract
Abstract A multilayered, hollow plastic container having resistance to elevated temperatures and barrier resistance, and a method for providing same. The container has an outer first portion of a material resistant to temperatures in excess of 175° F., an inner second portion of a material resistant to temperatures in excess of 175° F. and a third portion barrier layer of a thermoplastic material between said first and second portions. Also, a multilayered plastic sheet material having resistance to elevated temperatures and barrier resistance.
Inventors
- 👤 Emery I. Valyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:01
CPC Classifications
B; B32; B32B; B32B27/00; B65; B65D; B65D23/00; B65D23/02; B29; B29C; B29C2795/00; B29C2795/002; B29C2949/00; B29C2949/07; B29C2949/076; B29C2949/0768; B29C2949/077; B29C2949/30; B29C2949/3008; B29C2949/3009; B29C2949/3016; B29C2949/302; B29C2949/3024; B29C2949/3026; B29C2949/3032; B29C2949/3064; B29C2949/3066; B29C2949/3068; B29C2949/3074; B29C2949/3082; B29C2949/3084; B29C49/00; B29C49/42; B29C49/64; B29C49/6604; B29C49/6605; B29K; B29K2077/00; B29K2995/00; B29K2995/0037; B29K2995/0068; B29K2995/0069; B29L; B29L2031/00; B29L2031/712; B29L2031/7158; B29L2031/716; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/31504; Y10T428/31507; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
121 words
A multilayered, blown, seamless hollow plastic container having an open molded neck and having resistance to elevated temperatures and fluid barrier resistance having an outer pressure molded first portion of a plastic material resistant to temperatures in excess of 175° F. and an inner drawn second portion of a plastic material resistant to temperatures in excess of 175° F., wherein said container has a third drawn portion fluid barrier layer of a thermoplastic material between said first and second portions and in substantial conformity therewith, said barrier layer having a lower temperature resistance than said first and second portions, whereby said barrier layer progressively softens and reforms upon exposure to elevated temperature and subsequent cooling to retain its barrier resistant characteristics.
Claim 2
Dependent Claim
121 words
A multilayered, blown, seamless hollow plastic container having an open molded neck and having resistance to elevated temperatures and fluid barrier resistance having an outer pressure molded first portion of a plastic material resistant to temperatures in excess of 175° F. and an inner drawn second portion of a plastic material resistant to temperatures in excess of 175° F., wherein said container has a third drawn portion fluid barrier layer of a thermoplastic material between said first and second portions and in substantial conformity therewith, said barrier layer having a lower temperature resistance than said first and second portions, whereby said barrier layer progressively softens and reforms upon exposure to elevated temperature and subsequent cooling to retain its barrier resistant characteristics.
Claim 3
Dependent Claim
24 words
A container according to claim 1 wherein said first and second portions are thermoplastic and have resistance to temperatures in excess of 220° F.
Claim 4
Dependent Claim
31 words
A container according to claim 1 wherein said first and second portions are independently selected from the group consisting of polyolefins, polycarbonates, polysulfones, phenoxy resins, polyimines, ionomeric resins and acetal polymers.
Claim 5
Dependent Claim
28 words
A container according to claim 1 wherein said third portion barrier layer is selected from the group consisting of polyvinylidene chloride, polyvinyl acetate, acrylonitrile polymers and methacrylonitrile polymers.
Claim 6
Dependent Claim
31 words
A container according to claim 1 including an inner fourth portion of a thermoplastic material resistant to temperatures in excess of 175° F. between said first portion and said third portion.
Claim 7
Dependent Claim
12 words
A container according to claim 1 wherein said neck is externally threaded.
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) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |