US3377413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process in the extrusion of films of thermoplastic material in tubular form and an arrangement for carrying out the process
Assignee: Svenska Metallverken AB
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Filing: 1965-05-17
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Granted: 1968-04-09
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Expires: 1985-05-17
Abstract
No abstract record available.
Inventors
- 👤 Jansson Sven August
- 👤 Johansson John Iwan
- 👤 Mariedahl Erik Johan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:58
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
107 words
IN THE EXTRUSION OF FILMS OF THERMOPLASTIC MATERIAL IN TUBULAR FORM, IN WHICH THE TUBE IS FORCED OUT OF A NOZZLE, AND IS SUBJECTED TO AN INNER GAS PRESSURE, A METHOD OF COOLING THE TUBE COMPRISING THE STEPS OF DRAQING THE TUBE THROUGH AT LEAST ONE BODY OF COOLING LIQUID, AND THEN DRAWING THE TUBE FROM SAID LIQUID WHILE APPLYING A CONSTANT THIN EDGE PRESSURE CONTACT AROUND THE CIRCUMFERENCE OF SAID TUBE TO MAINTAIN A THIN LAYER OF LIQUID ON THE SURFACE OF THE TUBE TO LUBRICATE SAME, AND TO PREVENT THE FORMATION OF DROPLETS ON, AND THE RUNNING OF LIQUID DOWN, THE SURFACE OF SAID TUBE.
Claim 2
Dependent Claim
107 words
IN THE EXTRUSION OF FILMS OF THERMOPLASTIC MATERIAL IN TUBULAR FORM, IN WHICH THE TUBE IS FORCED OUT OF A NOZZLE, AND IS SUBJECTED TO AN INNER GAS PRESSURE, A METHOD OF COOLING THE TUBE COMPRISING THE STEPS OF DRAQING THE TUBE THROUGH AT LEAST ONE BODY OF COOLING LIQUID, AND THEN DRAWING THE TUBE FROM SAID LIQUID WHILE APPLYING A CONSTANT THIN EDGE PRESSURE CONTACT AROUND THE CIRCUMFERENCE OF SAID TUBE TO MAINTAIN A THIN LAYER OF LIQUID ON THE SURFACE OF THE TUBE TO LUBRICATE SAME, AND TO PREVENT THE FORMATION OF DROPLETS ON, AND THE RUNNING OF LIQUID DOWN, THE SURFACE OF SAID TUBE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |