US3296352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular film manufacture
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1962-07-20
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Granted: 1967-01-03
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Expires: 1982-07-20
Abstract
No abstract record available.
Inventors
- 👤 Riggs Aubrey Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:40
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN A CONTINUOUS BIAXIAL ORIENTATION PROCESS IN WHICH A TUBULAR THERMOPLASTIC FILM IS CONTINUOUSLY ADVANCED VERTICALLY DOWNWARDS, HEATED TO A TEMPERATURE BELOW ITS SOFTENING POINT WHICH IS SUITABLE FOR ORIENTATION AND IS STRETCHED BY INFLATION TO BIAXIALLY ORIENT IT, AND WITHDRAWING THE STRETCHED FILM, THE IMPROVEMENT WHICH COMPRISES HEATING THE TUBULAR FILM TO THE SAID TEMPERATURE BY PASSING IT THROUGH HEATING MEANS COMPRISING AT LEAST ONE INFRA-RED HEATER ENCLOSED IN A HOUSING AND SIMULTANEOUSLY APPLYING A FORCED CURRENT OF AIR AROUND THE CIRCUMFERENCE
Claim 2
Dependent Claim
83 words
IN A CONTINUOUS BIAXIAL ORIENTATION PROCESS IN WHICH A TUBULAR THERMOPLASTIC FILM IS CONTINUOUSLY ADVANCED VERTICALLY DOWNWARDS, HEATED TO A TEMPERATURE BELOW ITS SOFTENING POINT WHICH IS SUITABLE FOR ORIENTATION AND IS STRETCHED BY INFLATION TO BIAXIALLY ORIENT IT, AND WITHDRAWING THE STRETCHED FILM, THE IMPROVEMENT WHICH COMPRISES HEATING THE TUBULAR FILM TO THE SAID TEMPERATURE BY PASSING IT THROUGH HEATING MEANS COMPRISING AT LEAST ONE INFRA-RED HEATER ENCLOSED IN A HOUSING AND SIMULTANEOUSLY APPLYING A FORCED CURRENT OF AIR AROUND THE CIRCUMFERENCE
References Cited (Backward Citations)
US2433937A
Cited
FR1224548A
Cited
US3108851A
Cited
US3061876A
Cited
US3141912A
Cited
GB924571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |