Patent FR838219A successfully refreshed from Google Patents.
US4426427A
Expired / Lapsed
US
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Saturated preform and method for preparation thereof
Assignee: Individual
•
Filing: 1983-06-20
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Granted: 1984-01-17
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Expires: 2003-06-20
Abstract
Abstract Presaturated plastic preforms suitable for use in preparing molecularly oriented hollow articles from thermoplastic materials are obtained by adding controlled amounts of a saturant gas, under pressure, into a molten polymer stream residing in the screw channels of a screw plasticizer in a preform injection molding machine. The polymer so treated is then injected into cooled preform molds to obtain the desired article.
Inventors
- 👤 Wolf R. Vieth
- 👤 Leonard B. Ryder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:17
CPC Classifications
B; B29; B29B; B29B11/00; B29B11/06; B29B11/08; B29C; B29C45/00; B29C45/0001; B29C49/00; B29C49/0005; B29C2949/00; B29C2949/07; B29C2949/0861; B29C2949/0872; B29C2949/20; B29C2949/22; B29C2949/24; B29C2949/26; B29C2949/28; B29C2949/30; B29C2949/3024; B29C2949/3032; B29K; B29K2067/00; B29K2105/00; B29K2105/25; B29K2105/253; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1397
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
20 words
Presaturated plastic preform saturated with a dissolved presaturant gas selected from the group consisting of carbon dioxide, dichlorodifluoromethane, and oxygen.
Claim 2
Dependent Claim
20 words
Presaturated plastic preform saturated with a dissolved presaturant gas selected from the group consisting of carbon dioxide, dichlorodifluoromethane, and oxygen.
Claim 3
Dependent Claim
9 words
Preform in accordance with claim 1 comprising polyethylene terephthalate.
Claim 4
Dependent Claim
12 words
Preform in accordance with claim 2 wherein said gas is carbon dioxide.
Claim 5
Dependent Claim
11 words
Preform in accordance with claim 2 wherein said gas is dichlorodifluoromethane.
Claim 6
Dependent Claim
11 words
Preform in accordance with claim 1 wherein said gas is dichlorodifluoromethane.
Claim 7
Dependent Claim
14 words
Preform in accordance with claim 1 wherein the preform is supersaturated with said gas.
References Cited (Backward Citations)
US3144493A
Cited
US3225127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |