Patent US3207823A successfully refreshed from Google Patents.
US3207823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of flattened tubular plastic film
Assignee: Crown Packaging UK Ltd
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Filing: 1964-09-11
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Granted: 1965-09-21
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Expires: 1984-09-11
Abstract
No abstract record available.
Inventors
- 👤 Glyde Brian Stanley
- 👤 Fudakowski Wojciech Jan
- 👤 Whitbourn Kenneth Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:06
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/90; B29C48/901; B29C48/903; B29C48/03; B29C48/09; B29C48/10; B29C48/885; B29C48/911; B29C48/9115; B29C48/912
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
THE METHOD OF PRODUCING FLATENED TUBULAR PLASTIC FILM WHICH COMPRISES THE STEPS OF CONTINUOUSLY EXTRUDING A LATERALLY UNSUPPORTED TUBE OF MOLTEN PLASTIC MATERIAL IN A GENERALLY DOWNWARD DIRECTION ABOUT A SUBSTANTIALLY VERTICAL EXTRUSION AXIS, INFLATING THE TUBE AT A LEVEL NEAR THE EXTRUSION ORIFICE; AND SOLIDIFYING THE INFLATED TUBE BY DIRECTING AN ANNULAR STREAM OF COOLING LIQUID ONTO THE TUBE SUBSTANTIALLY AT SAID LEVEL OF INFLATION OF THE TUBE, SAID STREAM OF COOLING LIQUID BEING OF SUCH FORCE AND DIMENSIONS AS TO ENGAGE THE TUBE WITH A CONTINUOUS, CIRCULAR CURTAIN OF LIQUID HAVING RADIAL INWARD PRESSURE SUFFICIENT TO MINIMIZE LATERAL WANDERING TO THE TUBE FROM THE AXIS OF EXTRUSION.
Claim 2
Independent Claim
109 words
THE METHOD OF PRODUCING FLATENED TUBULAR PLASTIC FILM WHICH COMPRISES THE STEPS OF CONTINUOUSLY EXTRUDING A LATERALLY UNSUPPORTED TUBE OF MOLTEN PLASTIC MATERIAL IN A GENERALLY DOWNWARD DIRECTION ABOUT A SUBSTANTIALLY VERTICAL EXTRUSION AXIS, INFLATING THE TUBE AT A LEVEL NEAR THE EXTRUSION ORIFICE; AND SOLIDIFYING THE INFLATED TUBE BY DIRECTING AN ANNULAR STREAM OF COOLING LIQUID ONTO THE TUBE SUBSTANTIALLY AT SAID LEVEL OF INFLATION OF THE TUBE, SAID STREAM OF COOLING LIQUID BEING OF SUCH FORCE AND DIMENSIONS AS TO ENGAGE THE TUBE WITH A CONTINUOUS, CIRCULAR CURTAIN OF LIQUID HAVING RADIAL INWARD PRESSURE SUFFICIENT TO MINIMIZE LATERAL WANDERING TO THE TUBE FROM THE AXIS OF EXTRUSION.
References Cited (Backward Citations)
US3090998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |