US2987776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of biaxially stretching tubular styrene polymer film by inflating with gas and liquid
Assignee: Union Carbide Corp
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Filing: 1957-12-23
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Granted: 1961-06-13
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Expires: 1977-12-23
Abstract
No abstract record available.
Inventors
- 👤 Walter A Miller
- 👤 Stephen O Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:12
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/90; B29C48/907; B29C48/03; B29C48/09; B29C48/10; B29C48/901; B29C48/903; B29C48/911; B29C48/9115; B29C48/912; B29C48/919; B29C48/001; B29C48/0018; B29C48/0019; B29C48/885; B29K; B29K2025/00; B29K2995/00; B29K2995/0037; B29K2995/005; B29K2995/0053; Y; Y10; Y10S; Y10S264/00; Y10S264/73
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
METHOD WHICH COMPRISES EXTRUDING A CONTINUOUS THERMOPLASTIC TUBING OF A STYRENE POLYMER INTO A LIQUID BATH MAINTAINED AT A TEMPERATURE BELOW THE VISCOUS FLOW TEMPERATURE OF THE TUBING AND AT A TEMPERATURE WHEREIN THE TUBING IS IN THE RUBBERY, FORMATIVE STATE AND CAN BE MOLECULARLY ORIENTED BY A STRETCHING OPERATION, COOLING SAID TUBING AS ITS PASSES FROM POINT OF EXTRUSION INTO THE LIQUID BATH, MAINTAINING THE TUBING AT ITS EXTRUDED DIAMETER UNTIL THE TUBING IS COOLED TO ITS RUBBERY, FORMATIVE STATE WHILE MAINTAINING A FLUID MEDIUM UNDER PRESSURE
Claim 2
Dependent Claim
88 words
METHOD WHICH COMPRISES EXTRUDING A CONTINUOUS THERMOPLASTIC TUBING OF A STYRENE POLYMER INTO A LIQUID BATH MAINTAINED AT A TEMPERATURE BELOW THE VISCOUS FLOW TEMPERATURE OF THE TUBING AND AT A TEMPERATURE WHEREIN THE TUBING IS IN THE RUBBERY, FORMATIVE STATE AND CAN BE MOLECULARLY ORIENTED BY A STRETCHING OPERATION, COOLING SAID TUBING AS ITS PASSES FROM POINT OF EXTRUSION INTO THE LIQUID BATH, MAINTAINING THE TUBING AT ITS EXTRUDED DIAMETER UNTIL THE TUBING IS COOLED TO ITS RUBBERY, FORMATIVE STATE WHILE MAINTAINING A FLUID MEDIUM UNDER PRESSURE
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |