Patent US3331100A successfully refreshed from Google Patents.
US3331100A
Expired / Lapsed
US
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Extrusion apparatus
Assignee: Dow Chemical Co
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Filing: 1966-01-06
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Granted: 1967-07-18
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Expires: 1986-01-06
Abstract
No abstract record available.
Inventors
- 👤 Gordon E Gould
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:07
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/78; B29C48/80; B29C48/84; B29C48/85; B29C48/36; B29C48/50; B29C48/505; B29C48/51; B29C48/515; B29C48/83; B29C48/832; B29C48/845; B29C48/875; B29C48/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
197 words
IN AN APPARATUS FOR THE EXTRUSION OF SYNTHETIC RESINOUS THERMOPLASTIC MATERIAL COMPRISING IN COOPERATIVE COMBINATION A SCREW EXTRUDER HAVING A BARREL, THE BARREL HAVING A FIRST END, A SECOND END, MEANS TO PROVIDE SYNTHETIC RESINOUS THERMOPLSTIC MATERIAL TO THE FIRST END OF THE BARREL, MEANS TO DISCHARGE HEAT PLASTIFIED THERMOPLASTIC MATERIAL FROM THE SECONE END OF THE BARREL, A SCREW DISPOSED WITHIN THE BARREL AND ADAPTED TO FORWARD HEAT PLASTIFIED SYNTHETIC THERMOPLASTIC RESINOUS MATERIAL FROM THE FIRST END TO THE SECOND END OF THE BARREL, THE SCREW DEFINING AN INTERNAL CAVITY HAVING A GENERALLY CYLINDRICAL CONFIGURATION, A PLUG WITHIN THE CYLINDRICAL CAVITY ADAPTED TO DIVIDE THE CAVITY INTO FIRST AND SECOND HEAT EXCHANGE ZONES, THE FIRST OF SAID ZONES BEING DISPOSED ADJACENT THE FIRST END OF THE BARREL, THE SECOND HEAT EXCHANGE ZONE BEING DISPOSED ADJACENT THE SECOND END OF THE BARREL, AN INLET CONDUIT AND AN OUTLET CONDUIT OPERATIVELY CONNECTED WITH THE FIRST HEAT EXCHANGE ZONE, AN INLET AND AN OUTLET CONDUIT OPERATIVELY CONNECTED WITH THE SECOND HEAT EXCHANGE ZONE, THE IMPROVEMENT WHICH COMPRISES AN EXPANSIBLE PLUG SO CONSTRUCTED AND ARRANGED SO AS TO SELECTIVELY ENGAGE AND DISENGAGE A WALL OF THE CAVITY WITHIN THE SCREW.
Claim 2
Dependent Claim
197 words
IN AN APPARATUS FOR THE EXTRUSION OF SYNTHETIC RESINOUS THERMOPLASTIC MATERIAL COMPRISING IN COOPERATIVE COMBINATION A SCREW EXTRUDER HAVING A BARREL, THE BARREL HAVING A FIRST END, A SECOND END, MEANS TO PROVIDE SYNTHETIC RESINOUS THERMOPLSTIC MATERIAL TO THE FIRST END OF THE BARREL, MEANS TO DISCHARGE HEAT PLASTIFIED THERMOPLASTIC MATERIAL FROM THE SECONE END OF THE BARREL, A SCREW DISPOSED WITHIN THE BARREL AND ADAPTED TO FORWARD HEAT PLASTIFIED SYNTHETIC THERMOPLASTIC RESINOUS MATERIAL FROM THE FIRST END TO THE SECOND END OF THE BARREL, THE SCREW DEFINING AN INTERNAL CAVITY HAVING A GENERALLY CYLINDRICAL CONFIGURATION, A PLUG WITHIN THE CYLINDRICAL CAVITY ADAPTED TO DIVIDE THE CAVITY INTO FIRST AND SECOND HEAT EXCHANGE ZONES, THE FIRST OF SAID ZONES BEING DISPOSED ADJACENT THE FIRST END OF THE BARREL, THE SECOND HEAT EXCHANGE ZONE BEING DISPOSED ADJACENT THE SECOND END OF THE BARREL, AN INLET CONDUIT AND AN OUTLET CONDUIT OPERATIVELY CONNECTED WITH THE FIRST HEAT EXCHANGE ZONE, AN INLET AND AN OUTLET CONDUIT OPERATIVELY CONNECTED WITH THE SECOND HEAT EXCHANGE ZONE, THE IMPROVEMENT WHICH COMPRISES AN EXPANSIBLE PLUG SO CONSTRUCTED AND ARRANGED SO AS TO SELECTIVELY ENGAGE AND DISENGAGE A WALL OF THE CAVITY WITHIN THE SCREW.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |