Patent US3586748A successfully refreshed from Google Patents.
US3586748A
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Container forming method
Assignee: Dow Chemical Co
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Filing: 1968-11-29
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Granted: 1971-06-22
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Expires: 1988-11-29
Abstract
Abstract METHOD FOR EXTRUSION FORMING A PREFORM INTO A TUBULAR CLOSED END EXTRUSION WHICH IS TRIM-FREE. IN THE EXTRUSION PROCESS A LUG PUSHES A HEATED PREFORM THROUGH A RELATIVELY SMALL APERTURE IN THE MIDDLE OF A DIE PLATE, THE PLUG CAUSING THE PREFORM TO FLOW FROM THE OUTSIDE TOWARDS THE MIDDLE OF THE DIE PLATE TO FORM THE EXTRUSION THROUGH THE APERTURE. THE TRIM-FREE CLOSED END TUBULAR EXTRUSION CAN BE EMPLOYED AS A PARISON FOR A BLOW MOLDED CONTAINER HAVING A NARROW NECK.
Inventors
- 👤 Ralph E Ayres
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:08
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/22; B29C49/02; B29C49/06905; B29C49/0691; B29C51/00; B29C51/02; B29C51/04; B29C51/14; B29C51/26; B29C51/30; B29C51/32; B29C51/10
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |