Patent GB190224791A successfully refreshed from Google Patents.
US3108851A
Expired / Lapsed
US
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Method of biaxially stretching thermoplastic material
Assignee: Union Carbide Corp
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Filing: 1958-11-10
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Granted: 1963-10-29
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Expires: 1978-11-10
Abstract
No abstract record available.
Inventors
- 👤 Peter H Hofer
- 👤 William T Higgins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:21
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/001; B29C48/0018; B29C48/0019; B29C48/09; B29C48/10; Y; Y10; Y10S; Y10S383/00; Y10S383/908
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
METHOD OF BIAXIALLY STRETCHING THERMOPLASTIC MATERIAL WHICH COMPRISES EXTRUDING A THERMOPLASTIC MATERIAL INTO THE FORM OF A TUBING, WITHDRAWING SAID TUBING FROM THE POINT OF EXTRUSION AT A RATE GREATER THAN THE RATE OF EXTRUSION, COLLAPSING SAID TUBING AT A POINT SPACED FROM SAID POINT OF EXTRUSION, AND BETWEEN SAID POINT OF EXTRUSION AND SAID POINT OF COLLAPSING COOLING SAID TUBING TO A TEMPERATURE BELOW ABOUT 20*C. IN EXCESS OF THE SECOND ORDER PHRASE TRANSITION TEMPERATURE AND ABOVE THE SECOND ORDER PHASE TRANSITION TEMPERATURE THEREOF WHILE SAID TUBING IS MAINTAINED SUBSTANTIALLY AT ITS EXTRUDED DIAMETER, REHEATING SAID TUBING ABOVE ABOUT 20*C. IN EXCESS OF THE SECOND ORDER PHASE TRANSITION TEMPERATURE AND WITHIN A TEMPERATURE RANGE WHEREIN SAID TUBING CAN BE STRETCHED TO EFFECT A MOLECULAR ORIENTATION OF THE MOLECULES THEREOF AND EXPANDING SAID REHEATED TUBING TO A DIAMETER GREATER THAN ITS EXTRUDED DIAMETER.
Claim 2
Dependent Claim
143 words
METHOD OF BIAXIALLY STRETCHING THERMOPLASTIC MATERIAL WHICH COMPRISES EXTRUDING A THERMOPLASTIC MATERIAL INTO THE FORM OF A TUBING, WITHDRAWING SAID TUBING FROM THE POINT OF EXTRUSION AT A RATE GREATER THAN THE RATE OF EXTRUSION, COLLAPSING SAID TUBING AT A POINT SPACED FROM SAID POINT OF EXTRUSION, AND BETWEEN SAID POINT OF EXTRUSION AND SAID POINT OF COLLAPSING COOLING SAID TUBING TO A TEMPERATURE BELOW ABOUT 20*C. IN EXCESS OF THE SECOND ORDER PHRASE TRANSITION TEMPERATURE AND ABOVE THE SECOND ORDER PHASE TRANSITION TEMPERATURE THEREOF WHILE SAID TUBING IS MAINTAINED SUBSTANTIALLY AT ITS EXTRUDED DIAMETER, REHEATING SAID TUBING ABOVE ABOUT 20*C. IN EXCESS OF THE SECOND ORDER PHASE TRANSITION TEMPERATURE AND WITHIN A TEMPERATURE RANGE WHEREIN SAID TUBING CAN BE STRETCHED TO EFFECT A MOLECULAR ORIENTATION OF THE MOLECULES THEREOF AND EXPANDING SAID REHEATED TUBING TO A DIAMETER GREATER THAN ITS EXTRUDED DIAMETER.
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) | 1966-10-28 | 1967-04-29 | 1967-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-28 | 1971-04-29 | 1971-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-28 | 1975-04-29 | 1975-10-29 | $7700.00 | Window Closed / Lapsed |