US3299192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of extruding a foamed plastic tube having internal and external skins thereon
Assignee: Haveg Industries Inc
•
Filing: 1963-06-11
•
Granted: 1967-01-17
•
Expires: 1983-06-11
Abstract
No abstract record available.
Inventors
- 👤 John H Lux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:07
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/507; B29C48/00; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/32; B29C48/335; B29C48/10; B29L; B29L2023/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A METHOD OF FORMING A TUBULAR EXTRUSION OF A THERMOPLASTIC RESIN FORM COMPRISING EXTRUDING A HOT HOLLOW TUBE OF A FOAMABLE THERMOPLASTIC RESIN, QUENCH CHILLING THE EXTERNAL WALL OF SAID TUBE BY FLUID CHILLING MEANS SURROUNDING SAID WALL WITHIN A SHORT TIME AFTER IT EMERGES FROM THE EXTRUSION DIE TO FORM AN IMPERVIOUS, NON-POROUS, EXTERNAL SKIN, QUENCH CHILLING THE INTERNAL WALL OF SAID TUBE BY FLUID CHILLING MEANS SURROUNDED BY SAID WALL WITHIN A SHORT TIME AFTER IT EMERGES FROM THE EXTRUSION DIE TO FORM AN IMPERVIOUS, NON-POROUS, INTERNAL SKIN, SAID CHILLING OF SAID EXTERNAL AND INTERNAL WALLS BEING INSUFFICIENT TO COOL THE MAJOR PORTION OF THE TUBE WHEREBY THE CORE OF THE TUBE EXPANDS TO FORM A FOAM, SAID CORE BEING 50 TO 94% OF THE THICKNESS OF SAID TUBE.
Claim 2
Independent Claim
131 words
A METHOD OF FORMING A TUBULAR EXTRUSION OF A THERMOPLASTIC RESIN FORM COMPRISING EXTRUDING A HOT HOLLOW TUBE OF A FOAMABLE THERMOPLASTIC RESIN, QUENCH CHILLING THE EXTERNAL WALL OF SAID TUBE BY FLUID CHILLING MEANS SURROUNDING SAID WALL WITHIN A SHORT TIME AFTER IT EMERGES FROM THE EXTRUSION DIE TO FORM AN IMPERVIOUS, NON-POROUS, EXTERNAL SKIN, QUENCH CHILLING THE INTERNAL WALL OF SAID TUBE BY FLUID CHILLING MEANS SURROUNDED BY SAID WALL WITHIN A SHORT TIME AFTER IT EMERGES FROM THE EXTRUSION DIE TO FORM AN IMPERVIOUS, NON-POROUS, INTERNAL SKIN, SAID CHILLING OF SAID EXTERNAL AND INTERNAL WALLS BEING INSUFFICIENT TO COOL THE MAJOR PORTION OF THE TUBE WHEREBY THE CORE OF THE TUBE EXPANDS TO FORM A FOAM, SAID CORE BEING 50 TO 94% OF THE THICKNESS OF SAID TUBE.
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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) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |