Patent US3337665A successfully refreshed from Google Patents.
US3337665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of thermoplastic film
Assignee: Union Carbide Corp
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Filing: 1966-04-27
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Granted: 1967-08-22
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Expires: 1986-04-27
Abstract
No abstract record available.
Inventors
- 👤 William F Underwood
- 👤 Joseph N Craver
- 👤 Sacks William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:33
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/335; B29C48/337; B29C48/338; B29C48/03; B29C48/09; B29C48/10; B29C48/14; B29C48/147; B29C48/1472; B29C48/16; B29C48/18; B29C48/21; B29C2791/00; B29C2791/004; B29C2791/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
A METHOD OF PRODUCING CONTINUOUS SEAMLESS TUBING HAVING A LOW MELT-VISCOSITY AT ITS EXTRUSION TEMPERATURE SUCH THAT IT IS NON-SELF-SUSTAINING INTHE MOLTEN STATE UPWARDLY THROUGH AN INNER ANNULAR ORIFICE AND ONTO A MELT OF A SUPPORTING THERMOPLASTIC POLYMER HAVING A HIGH MELTVISCOSITY AT ITS EXTRUSION TEMPERATURE SUCH THAT IT SUPPORTS BOTH ITSELF AND THE LOW MELT-VISCOSITY POLYMER WHILE IN THE MOLTEN STATE, SAID SUPORTING THERMOPLASTIC POLYMER BEING SIMULTANEOUSLY AND CONCENTRICALLY EXTRUDED THROUGH AN ADJACENT OUTER ANNULAR ORIFICE UPWARDLY PARALLEL AND EXTERIOR TO AND IN CONTACT WITH THE LOW MELT-VISCOSITY THERMOPLASTIC POLYMER TO FORM CONCENTRIC LAYERS OF SEAMLESS POLYMERIC TUBING; CONTINUOUSLY WITHDRAWING THE CONCENTRIC TUBING; CONSTRICTING THE CONCENTRIC TUBINGS AT A POINT SPACED FROM THE POINT OF EXTRUSION AND MAINTAINING A BUBBLE OF A FLUID MEDIUM UNDER PRESSURE IN THE TUBING BETWEEN THE POINT OF EXTRUSION AND THE POINT OF CONSTRICTION TO CAUSE THE DISTENTION THEREOF; AND REMOVING THE OUTER HIGH MELT VISCOSITY SEAMLESS TUBING FROM THE INNER LOW MELT VISCOSITY SEAMLESS TUBING.
Claim 2
Independent Claim
162 words
A METHOD OF PRODUCING CONTINUOUS SEAMLESS TUBING HAVING A LOW MELT-VISCOSITY AT ITS EXTRUSION TEMPERATURE SUCH THAT IT IS NON-SELF-SUSTAINING INTHE MOLTEN STATE UPWARDLY THROUGH AN INNER ANNULAR ORIFICE AND ONTO A MELT OF A SUPPORTING THERMOPLASTIC POLYMER HAVING A HIGH MELTVISCOSITY AT ITS EXTRUSION TEMPERATURE SUCH THAT IT SUPPORTS BOTH ITSELF AND THE LOW MELT-VISCOSITY POLYMER WHILE IN THE MOLTEN STATE, SAID SUPORTING THERMOPLASTIC POLYMER BEING SIMULTANEOUSLY AND CONCENTRICALLY EXTRUDED THROUGH AN ADJACENT OUTER ANNULAR ORIFICE UPWARDLY PARALLEL AND EXTERIOR TO AND IN CONTACT WITH THE LOW MELT-VISCOSITY THERMOPLASTIC POLYMER TO FORM CONCENTRIC LAYERS OF SEAMLESS POLYMERIC TUBING; CONTINUOUSLY WITHDRAWING THE CONCENTRIC TUBING; CONSTRICTING THE CONCENTRIC TUBINGS AT A POINT SPACED FROM THE POINT OF EXTRUSION AND MAINTAINING A BUBBLE OF A FLUID MEDIUM UNDER PRESSURE IN THE TUBING BETWEEN THE POINT OF EXTRUSION AND THE POINT OF CONSTRICTION TO CAUSE THE DISTENTION THEREOF; AND REMOVING THE OUTER HIGH MELT VISCOSITY SEAMLESS TUBING FROM THE INNER LOW MELT VISCOSITY SEAMLESS TUBING.
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) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |