US3085290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for producing large diameter thin wall tubing of polytetrafluoroethylene
Assignee: Resistoflex Corp
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Filing: 1959-12-09
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Granted: 1963-04-16
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Expires: 1979-12-09
Abstract
No abstract record available.
Inventors
- 👤 Edward J Chu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:05
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/09; B29C48/10; B29K; B29K2027/00; B29K2027/12; B29K2027/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
89 words
APPARATUS FOR USE IN PRODUCING DISCRETE LENGTHS OF LARGE DIAMETER THIN WALL P.T.F.E TUBING BY EXTRUSION COMPRISING A PAIR OF TELESCOPED PIPES OF DIFFERENT DIAMETER SEPARATED BY SPACING MEANS AT ONE OF THEIR ENDS AND SECURED TOGETHER WITH THE INNER PIPE BEING SLIGHTLY LONGER AND EXTENDING BEYOND THE OUTER PIPE AT THE OTHER OF THEIR ENDS, MEANS FOR VERTICALLY SUPPORTING THE PIPES BELOW A VERTICAL, EXTRUDER WITH SAID SPACING MEANS AT THE BOTTOM AND THE UPPER ENDS OF THE PIPES POSITIONED FOR RECEIVING EXTRUDED MATERIAL THEREBETWEEN, AND ADDITIONAL SPACING
References Cited (Backward Citations)
US1595811A
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US2631351A
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US2456621A
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US2810934A
Cited
US2889581A
Cited
US2949371A
Cited
US2938235A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-15 | 1966-10-15 | 1967-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-15 | 1970-10-15 | 1971-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-15 | 1974-10-15 | 1975-04-16 | $7700.00 | Window Closed / Lapsed |