Patent US3629389A successfully refreshed from Google Patents.
US3629389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for flaring the upper ends of plastic bags
Assignee: Millennium Petrochemicals Inc
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Filing: 1967-04-07
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Granted: 1971-12-21
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Expires: 1987-04-07
Abstract
Abstract IN ORDER TO CAUSE THE OPPOSING PANEL ENDS OF A PLASTIC BAG TO CURL OUTWARDLY, THE BAGS ARE CAPTURED BETWEEN MOVING BELTS WITH A PORTION OF THEIR UPPR SURFACES EXTENDING ABOVE THE BELTS. THE OUTER SURFACES OF THE BAG PANELS ARE HEATED, AND THE PANEL EDGES ARE FORCED TO FLARE OPEN BY PASSING THROUGH A STIFF WIRE. THE INTERIOR SURFACES OF THE OPEN PANEL LIPS ARE THEN RAPIDLY COOLED TO INTRODUCE A PERMANENT TENDENCY FOR THE BAG PANEL AT THE BAG OPENING TO CURL AWAY FROM ONE ANOTHER.
Inventors
- 👤 John J Quackenbush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:18
CPC Classifications
B; B29; B29C; B29C67/00; Y; Y10; Y10S; Y10S264/00; Y10S264/66
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |