Patent US3871802A successfully refreshed from Google Patents.
US3871802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dressing ring for tubular expanded polystyrene cooling mandrel
Assignee: OI Glass Inc
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Filing: 1973-06-04
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Granted: 1975-03-18
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Expires: 1993-06-04
Abstract
Abstract A surface treating device to be attached to the upstream end of a cooling and sizing mandrel used in the manufacture of a web of expanded polystyrene of a general purpose grade from a warm, tubular extrudate of such material, such treating device serving to prepare the dense, radially innermost surface of such tubular extrudate so that it can be drawn over the cooled, cooling and sizing mandrel in tight, surface to surface contact therewith to substantially reduce the amount of material from the web which accumulates on the cooling and sizing mandrel.
Inventors
- 👤 Maurice W Blackwelder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:57
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/507; B29C48/00; B29C48/03; B29C48/09; B29C48/10; B29C48/25; B29C48/88; B29C48/89; B29C48/90; B29C48/908; B29C48/911; B29C48/9115; B29C48/912; B29C48/001; B29C48/0018; B29L; B29L2023/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
IN APPARATUS FOR PRODUCING A WEB OF EXPANDED POLYSTYRENE COMPRISING AN EXTRUDER FOR EXTRUDING A TUBULAR EXTRUDATE, MENS FOR EXPANDING THE EXTRUDATE AND A COOLING MANDREL OVER WHICH THE EXPANDED EXTRUDATE IS DRAWN IN SURFACE TO SURFACE CONTACT THEREWITH, THE IMPROVEMENT COMPRISING: A CONTACTING RING FOR DRESSING THE INSIDE SURFACE OF THE EXTRUDATE WHICH IS THIN IN THE LONGITUDINAL DIRECTION RELATIVE TO THE MANDREL, WHICH HAS AN EXTRUDATE-C0NTACTING OUTSIDE SURFACE WHICH IS POSITIONED TO CONTACT THE EXTRUDATE AT A LOCATION WHERE THE EXTRUDATE HAS REACHED ITS FINAL DIAMETER, WHICH IS DISPOSED
Claim 2
Dependent Claim
91 words
IN APPARATUS FOR PRODUCING A WEB OF EXPANDED POLYSTYRENE COMPRISING AN EXTRUDER FOR EXTRUDING A TUBULAR EXTRUDATE, MENS FOR EXPANDING THE EXTRUDATE AND A COOLING MANDREL OVER WHICH THE EXPANDED EXTRUDATE IS DRAWN IN SURFACE TO SURFACE CONTACT THEREWITH, THE IMPROVEMENT COMPRISING: A CONTACTING RING FOR DRESSING THE INSIDE SURFACE OF THE EXTRUDATE WHICH IS THIN IN THE LONGITUDINAL DIRECTION RELATIVE TO THE MANDREL, WHICH HAS AN EXTRUDATE-C0NTACTING OUTSIDE SURFACE WHICH IS POSITIONED TO CONTACT THE EXTRUDATE AT A LOCATION WHERE THE EXTRUDATE HAS REACHED ITS FINAL DIAMETER, WHICH IS DISPOSED
Claim 3
Dependent Claim
60 words
Apparatus according to claim 1 and further comprising a spacer ring which is thin in the longitudinal direction relative to the mandrel, which is disposed in the space between the contacting ring and the mandrel and which is substantially out of contact with the extrudate to thermally isolate the contacting ring from the means used to cool the cooling mandrel.
Claim 4
Dependent Claim
27 words
Apparatus according to claim 2 and further comprising fastener means extending through the spacer ring for attaching the contacting ring and the spacer ring to the mandrel.
References Cited (Backward Citations)
US3426111A
Cited
US3765808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |