Patent US3404203A successfully refreshed from Google Patents.
US3404203A
Expired / Lapsed
US
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Method of extruding bi-helically oriented thermoplastic tube
Assignee: Dow Chemical Co
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Filing: 1965-01-28
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Granted: 1968-10-01
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Expires: 1985-01-28
Abstract
No abstract record available.
Inventors
- 👤 Donald Harold Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:06
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/33; B29C48/022; B29C48/03; B29C48/09; B29C48/001; B29C48/0018; B29K; B29K2105/00; B29K2105/06; B29K2105/12; B29K2709/00; B29K2709/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN A METHOD FOR THE EXTRUSION OF A THERMOPLASTIC RESINOUS TUBE COMPRISING EXTRUDING A HEAT PLASTIFIED THERMOPLASTIC RESINOUS MATERIAL THROUGH AN ANNULAR DIE, THE ANNULAR DIE ORIFICE BEING DEFINED BY INNER AND OUTER ORIFICE WALLS, AND SUBSEQUENTLY COOLING THE HEAT PLASTIFIED THERMOPLASTIC MATERIAL BELOW ITS HEAT PLASTIFYING TEMPERATURE TO PROVIDE A GENERALLY CYLINDRICAL TUBE HAVING A DIAMETER ABOUT EQUAL TO THE DIAMETER OF THE DIE ORIFICE, THE IMPROVEMENT WHICH COMPRISES ROTATING THE ORIFICE WALLS IN OPPOSITE DIRECTIONS THEREBY AND MOLECULARLY ORIENTING THE HEAT
Claim 2
Dependent Claim
83 words
IN A METHOD FOR THE EXTRUSION OF A THERMOPLASTIC RESINOUS TUBE COMPRISING EXTRUDING A HEAT PLASTIFIED THERMOPLASTIC RESINOUS MATERIAL THROUGH AN ANNULAR DIE, THE ANNULAR DIE ORIFICE BEING DEFINED BY INNER AND OUTER ORIFICE WALLS, AND SUBSEQUENTLY COOLING THE HEAT PLASTIFIED THERMOPLASTIC MATERIAL BELOW ITS HEAT PLASTIFYING TEMPERATURE TO PROVIDE A GENERALLY CYLINDRICAL TUBE HAVING A DIAMETER ABOUT EQUAL TO THE DIAMETER OF THE DIE ORIFICE, THE IMPROVEMENT WHICH COMPRISES ROTATING THE ORIFICE WALLS IN OPPOSITE DIRECTIONS THEREBY AND MOLECULARLY ORIENTING THE HEAT
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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) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |