US3671349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method of making round bottom plastic liners for shipping containers
Assignee: Westlake Plastics Co
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Filing: 1969-08-22
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Granted: 1972-06-20
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Expires: 1989-08-22
Abstract
Abstract A method of making a removable plastic liner for containers wherein a flexible plastic tubular section is loosely draped over a relatively narrow disc-like mandrel until a relatively short end portion thereof projects beyond the mandrel and mechanically or pneumatically expanding a relatively narrow area of the tubular section at the mandrel to cause the projection portion to turn inwardly and form a flange to which a bottom sheet can be readily bonded, the invention making it possible to drape the tubular section over and remove it from the mandrel with relative ease.
Inventors
- 👤 Edward B Westlake Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:16
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/78; B29C65/7841; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/13; B29C66/131; B29C66/20; B29C66/24; B29C66/242; B29C66/2422; B29C66/24221; B29C66/50; B29C66/51; B29C66/53; B29C66/534; B29C66/5346; B29C66/53461; B29C66/63; B29C66/634; B29C66/80; B29C66/81; B29C66/814; B29C66/8145; B29C66/81457; B29C66/83; B29C66/832; B29C66/8322; B65; B65D; B65D25/00; B65D25/14; B65D25/16; Y; Y10; Y10S; Y10S383/00; Y10S383/907
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |