US2938235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for sintering polytetrafluoroethylene tubing
Assignee: Resistoflex Corp
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Filing: 1956-12-28
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Granted: 1960-05-31
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Expires: 1976-12-28
Abstract
No abstract record available.
Inventors
- 👤 Irving D Press
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:15
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/02; B29C67/04; B29B; B29B13/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
IN THE PROCESS OF SINTERING AND SUBSEQUENTLY QUENCHING AN ELONGATED TUBULAR MEMBER OF POLYTETRAFLUOROETHYLENE OR THE LIKE MATERIAL WHICH IS SUPPORTED WITHIN A PROTECTIVE TUBE WHILE BEING QUENCHED, THE STEPS OF INSERTING INTO THE TUBULAR MEMBER BEFORE IT IS QUENCHED A LIGHT WEIGHT CORE MEMBER HAVING A DIAMETER SLIGHTLY LESS THAN THE INTERNAL DIAMETER OF THE TUBING AND OF SUFFICIENT STRENGTH TO PREVENT THE TUBULAR MEMBER FROM COLLAPSING, AS DISTINGUISHED FROM NATURAL SHRINKAGE, DURING THE QUENCHING OPERATION BUT ADAPTED TO BE READILY REMOVABLE THEREFROM AFTER THE QUENCHING OPERATION, AND THEREAFTER QUENCHING SAID TUBULAR MEMBER BY IMMERSION IN A WATER BATH WITH THE CORE MEMBER IN PLACE.
Claim 2
Dependent Claim
106 words
IN THE PROCESS OF SINTERING AND SUBSEQUENTLY QUENCHING AN ELONGATED TUBULAR MEMBER OF POLYTETRAFLUOROETHYLENE OR THE LIKE MATERIAL WHICH IS SUPPORTED WITHIN A PROTECTIVE TUBE WHILE BEING QUENCHED, THE STEPS OF INSERTING INTO THE TUBULAR MEMBER BEFORE IT IS QUENCHED A LIGHT WEIGHT CORE MEMBER HAVING A DIAMETER SLIGHTLY LESS THAN THE INTERNAL DIAMETER OF THE TUBING AND OF SUFFICIENT STRENGTH TO PREVENT THE TUBULAR MEMBER FROM COLLAPSING, AS DISTINGUISHED FROM NATURAL SHRINKAGE, DURING THE QUENCHING OPERATION BUT ADAPTED TO BE READILY REMOVABLE THEREFROM AFTER THE QUENCHING OPERATION, AND THEREAFTER QUENCHING SAID TUBULAR MEMBER BY IMMERSION IN A WATER BATH WITH THE CORE MEMBER IN PLACE.
References Cited (Backward Citations)
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US2280102A
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US2389038A
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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) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |