US3205289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving bursting strength of plastic pipe
Assignee: Union Carbide Corp
•
Filing: 1961-07-18
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Granted: 1965-09-07
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Expires: 1981-07-18
Abstract
No abstract record available.
Inventors
- 👤 Louis L Carpenter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:02
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/0003; B29C48/00; B29C48/001; B29C67/0029; B29C48/03; B29C48/09; B29L; B29L2023/00; B29L2023/22; Y; Y10; Y10S; Y10S264/00; Y10S264/66; Y10T; Y10T74/00; Y10T74/20; Y10T74/20396; Y10T74/20402; Y10T74/20462
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A METHOD OF INCREASING THE BURSTING STRENGTH OF THERMOPLASTIC PIPE WHICH COMPRISES COLD WORKING A SOLID EXTRUDED THERMOPLASTIC PIPE BY INSERTING A MANDREL THREIN HAVING AN OUTER DIAMETER OF AT LEAST EQUAL TO THE INNER DIAMETER OF THE PIPE, AND THEN APPLYING DEFORMATIVE PRESSURE IN AT LEAST ONE PASS FROM A ROTATABLE PRESSURE MEANS ADAPTED TO SIMULTANEOUSLY TRANSMIT SUFFICIENT FORCE IN LONGITUDINAL AND CIRCUMFERENTIAL DIRECTIONS TO THE OUTER PERIPHERY OF SAID PIPE DEFORMING THE SAME AND CAUSING THE THERMOPLASTIC TO FLOW AND ORIENT ITSELF IN SUCH DIRECTIONS WHILE MAINTAINING THE INTERNAL DIAMETER OF THE PIPE SUBSTANTIALLY THE SAME WHILE KEEPING THE THERMOPLASTIC AT A TEMPERATURE BELOW ITS FIRST-ORDER TRANSITION TEMPERATURE AND ABOVE ITS SECOND-ORDER TRANSITION TEMPERATURE WITH THE DEFORMATIONS AT ANY ONE PASS NOT EXCEEDING ITS ULTIMATE TENSILE STRENGTH WHILE ABOVE ITS YIELD VALUE.
Claim 2
Independent Claim
134 words
A METHOD OF INCREASING THE BURSTING STRENGTH OF THERMOPLASTIC PIPE WHICH COMPRISES COLD WORKING A SOLID EXTRUDED THERMOPLASTIC PIPE BY INSERTING A MANDREL THREIN HAVING AN OUTER DIAMETER OF AT LEAST EQUAL TO THE INNER DIAMETER OF THE PIPE, AND THEN APPLYING DEFORMATIVE PRESSURE IN AT LEAST ONE PASS FROM A ROTATABLE PRESSURE MEANS ADAPTED TO SIMULTANEOUSLY TRANSMIT SUFFICIENT FORCE IN LONGITUDINAL AND CIRCUMFERENTIAL DIRECTIONS TO THE OUTER PERIPHERY OF SAID PIPE DEFORMING THE SAME AND CAUSING THE THERMOPLASTIC TO FLOW AND ORIENT ITSELF IN SUCH DIRECTIONS WHILE MAINTAINING THE INTERNAL DIAMETER OF THE PIPE SUBSTANTIALLY THE SAME WHILE KEEPING THE THERMOPLASTIC AT A TEMPERATURE BELOW ITS FIRST-ORDER TRANSITION TEMPERATURE AND ABOVE ITS SECOND-ORDER TRANSITION TEMPERATURE WITH THE DEFORMATIONS AT ANY ONE PASS NOT EXCEEDING ITS ULTIMATE TENSILE STRENGTH WHILE ABOVE ITS YIELD VALUE.
References Cited (Backward Citations)
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US2307817A
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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) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |