Patent US3234312A successfully refreshed from Google Patents.
US3234312A
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Method of orienting thermoplastic pipe
Assignee: EIDP Inc
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Filing: 1965-02-01
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Granted: 1966-02-08
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Expires: 1985-02-01
Abstract
No abstract record available.
Inventors
- 👤 Jordan Thomas Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:30
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/22; B29C55/24; B29C53/00; B29C53/14; B29C48/00; B29C48/001; B29C48/0018; B29C48/03; B29C48/09; B29K; B29K2027/00; B29K2059/00; B29K2995/00; B29K2995/0037; B29K2995/005; B29K2995/0053; B29K2995/0077
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A PROCESS FOR THE MANUFACUTURE OF SEAMLESS ORIENTED PIPE OF THERMOPLASTIC MATERIAL WHICH COMPRISES EXTRUDING A THICK-WALLED CYLINDRICAL PIPE OF THERMOPLASTIC MATERIAL, ADJUSTING THE TEMPERATURE OF SAID THICK-WALLED PIPE TO THE SOFTENING TEMPERATURE OF THE SAID THERMOPLASTIC, TWISTING THE SAID THICK-WALLED PIPE TO A TWIST ANGLE OF FROM ABOUT 10* TO ABOUT 70* MEASURED FROM THE AXIAL DIRECTION AND EXTENDING THE SAID THICK-WALLED PIPE TO PRODUCE A FINISHED PIPE HAVING BIAXIAL ORIENTATION AND HAVING AN EXTERNAL VOLUME AT LEAST 10% GREATER THAN THE EXTERNAL VOLUME OF THE SAID THICK-WALLED PIPE.
Claim 2
Dependent Claim
90 words
A PROCESS FOR THE MANUFACUTURE OF SEAMLESS ORIENTED PIPE OF THERMOPLASTIC MATERIAL WHICH COMPRISES EXTRUDING A THICK-WALLED CYLINDRICAL PIPE OF THERMOPLASTIC MATERIAL, ADJUSTING THE TEMPERATURE OF SAID THICK-WALLED PIPE TO THE SOFTENING TEMPERATURE OF THE SAID THERMOPLASTIC, TWISTING THE SAID THICK-WALLED PIPE TO A TWIST ANGLE OF FROM ABOUT 10* TO ABOUT 70* MEASURED FROM THE AXIAL DIRECTION AND EXTENDING THE SAID THICK-WALLED PIPE TO PRODUCE A FINISHED PIPE HAVING BIAXIAL ORIENTATION AND HAVING AN EXTERNAL VOLUME AT LEAST 10% GREATER THAN THE EXTERNAL VOLUME OF THE SAID THICK-WALLED PIPE.
References Cited (Backward Citations)
CA578361A
Cited
US2494689A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |