Patent US2933769A successfully refreshed from Google Patents.
US2933769A
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Extrusion of plastic onto a mandrel
Assignee: Resistoflex Corp
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Filing: 1955-09-30
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Granted: 1960-04-26
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Expires: 1975-09-30
Abstract
No abstract record available.
Inventors
- 👤 Harold F Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:15
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/022; B29C48/001; B29C48/0022; B29C48/03; B29C48/09; B29C48/10; B29K; B29K2027/00; B29K2027/12; B29K2027/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
THE METHOD OF OVERCOMING FRICTIONAL RESISTANCE TO THE EXTRUSION OF AN ELONGATED TUBE ONTO A HOLLOW METAL MANDREL OF SMALLER DIAMETER THAN THE TUBING WHICH COMPRISES DISPOSING THE MANDREL AT A SLIGHT ANGLE TO THE HORIZONTAL, CONTINUALLY INJECTING LIQUID INTO THE LOWER END OF THE MANDREL TO FLOW OUT OF ITS HIGHER END INSIDE THE TUBE BEING EXTRUDED THEREON AND BACK OUT THE LEADING END OF THE TUBE IN SUFFICIENT QUANTITY TO MAINTAIN A CONSTANTLY FLOWING STREAM OF LIQUID BETWEEN THE TUBE AND THE MANDREL SUFFICIENT TO TEND TO FLOAT THE TUBE THEREALONG, WHEREBY THE TUBE MOVES ALONG THE MANDREL SUBSTANTIALLY OUT OF DIRECT CONTACT THEREWITH.
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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) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |