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Patent US4120932A successfully refreshed from Google Patents.
US4120932A
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Method of fabricating plastic containers having reduced gas permeability from a composite billet
Assignee: PLASTIC PACKAGING PRODUCTS Co A CORP OF DELAWARE
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Filing: 1976-11-24
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Granted: 1978-10-17
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Expires: 1996-11-24
Abstract
Abstract Plastic containers having improved physical properties are prepared from a composite billet having an outer peripheral area composed of a thermoplastic resin and an inner central core portion composed of the thermoplastic resin modified with a material which imparts improved physical properties such as reduced gas permeability or increased stiffness or rigidity to the resin. The composite billet is molded into a container wherein the billet core is formed into the sidewalls and bottom of the container and the peripheral portion is formed into a flexible thermoplastic flange surrounding the open end of the container which can be doubled seamed to a metal end closure without fracture.
Inventors
- 👤 Donald J. Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:14
CPC Classifications
B; B65; B65D; B65D15/00; B65D15/02; B65D15/16; B65D15/18; B29; B29C; B29C43/00; B29C43/02; B29C43/16; B29C51/00; B29C51/002; B29C51/02; B29C51/08; B29C51/082; B29C70/00; B29C70/58; B29C70/60; B29C70/603; B65D1/00; B65D1/12; B65D1/14; B65D1/16; B65D1/165; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/10; B29K2023/12; B29K2025/00; B29K2105/00; B29K2105/06; B29K2105/16; B29K2105/25; B29K2105/253; Y; Y02; Y02A; Y02A40/00; Y02A40/90
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
122 words
A method of forming a thermoplastic container having increased resistance to gas permeability which comprises preparing a composite billet comprised of an outer peripheral area consisting essentially of a moldable thermoplastic resin and an internal central core comprised of the thermoplastic resin modified with a second material which lowers the gas pemeability of the resin, the outer peripheral area being substantially devoid of the second material, and then molding the billet into a hollow container having a body closed at one end and terminating in an upper open end surrounded with a peripheral flange integral with the body, the flange being formed from the thermoplastic outer peripheral area of the billet and the body being formed from the modified thermoplastic billet core.
Claim 2
Independent Claim
122 words
A method of forming a thermoplastic container having increased resistance to gas permeability which comprises preparing a composite billet comprised of an outer peripheral area consisting essentially of a moldable thermoplastic resin and an internal central core comprised of the thermoplastic resin modified with a second material which lowers the gas pemeability of the resin, the outer peripheral area being substantially devoid of the second material, and then molding the billet into a hollow container having a body closed at one end and terminating in an upper open end surrounded with a peripheral flange integral with the body, the flange being formed from the thermoplastic outer peripheral area of the billet and the body being formed from the modified thermoplastic billet core.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the outer peripheral area of the composite billet is formed from polyethylene.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein the outer peripheral area of the composite billet is formed from polypropylene.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein the outer peripheral area of the composite billet is formed from polystyrene.
Claim 6
Dependent Claim
54 words
The method of claim 1 wherein the billet core is formed from a blend of a first thermoplastic resin having high gas permeability and a second resin having low gas permeability selected from the group consisting of vinylidene chloride polymers, nylon and acrylonitrile copolymers having an acrylonitrile content of at least 60% by weight.
Claim 7
Dependent Claim
60 words
The method of claim 1 wherein the billet core is formed of a laminate of a sheet of a first thermoplastic resin having high gas permeability and a sheet of a second resin having low gas permeability selected from the group consisting of vinylidene chloride polymers, nylon and acrylonitrile copolymers having an acrylonitrile content of at least 60% by weight.
Claim 8
Dependent Claim
21 words
The method of claim 1 wherein the billet core is formed from a blend of a thermoplastic resin and a filler.
Claim 9
Dependent Claim
11 words
The method of claim 7 wherein the filler is wood flour.
Claim 10
Dependent Claim
22 words
The method of claim 1 wherein the billet core is formed from a blend of a thermoplastic resin and a mineral filler.
Claim 11
Dependent Claim
10 words
The method of claim 9 wherein the filler is mica.
Claim 12
Dependent Claim
11 words
The method of claim 9 wherein the filler is asbestos fiber.
Claim 13
Dependent Claim
12 words
The method of claim 9 wherein the filler is CaCO 3 .
Claim 14
Dependent Claim
12 words
The method of claim 9 wherein the filler is TiO 2 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |