US3135994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for adjusting back-pressure in extruders during continuous operations
Assignee: Monsanto Chemicals Ltd
•
Filing: 1960-11-30
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Granted: 1964-06-09
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Expires: 1980-11-30
Abstract
No abstract record available.
Inventors
- 👤 Skinner Stanley John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:35
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/92514; B29C2948/92819; B29C2948/92961; B29C48/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
AN APPARATUS FOR ADJUSTING BACK-PRESSURE IN AN EXTRUDER WITHOUT INTERRUPTING EXTRUSION OPERATION COMPRISING, IN COMBINATION, A BORE DEFINED BY AN ELONGATED CASING HAVING AN INLET ADAPTED TO BE FITTED TO THE DISCHARGE END OF AN EXTRUDER AND AN OUTLET, AND A SOLID CYLINDRICAL PLUNGER SLIDABLY MOUNTED WITHIN SAID BORE AT POSITIONS (1) BELOW SAID INLET TO THE BORE AND (2) ABOVE SAID OUTLET BY SEALING MEANS, SAID CYLINDRICAL PLUNGER HAVING A LARGER DIAMETER ALONG THE PORTION ADJACENT THE INLET TO SAID BORE, THAN ALONG THE PORTION ADJACENT THE OUTLET FROM SAID BORE THEREBY DEFINING TWO CO-EXTENSIVE ANNULAR ORIFICES HAVING DIFFERENT CROSS-SECTIONAL AREAS BETWEEN SAID PLUNGER AND SAID CASING, THE LENGTHS OF WHICH ARE VARIED BY MOVEMENT OF SAID PLUNGER AXIALLY WHEREBY THE BACK-PRESSURE IN THE EXTRUDER AND THE DEGREE OF MATERIAL REFINING IS CONTROLLED DURING EXTRUSION OPERATION.
Claim 2
Independent Claim
137 words
AN APPARATUS FOR ADJUSTING BACK-PRESSURE IN AN EXTRUDER WITHOUT INTERRUPTING EXTRUSION OPERATION COMPRISING, IN COMBINATION, A BORE DEFINED BY AN ELONGATED CASING HAVING AN INLET ADAPTED TO BE FITTED TO THE DISCHARGE END OF AN EXTRUDER AND AN OUTLET, AND A SOLID CYLINDRICAL PLUNGER SLIDABLY MOUNTED WITHIN SAID BORE AT POSITIONS (1) BELOW SAID INLET TO THE BORE AND (2) ABOVE SAID OUTLET BY SEALING MEANS, SAID CYLINDRICAL PLUNGER HAVING A LARGER DIAMETER ALONG THE PORTION ADJACENT THE INLET TO SAID BORE, THAN ALONG THE PORTION ADJACENT THE OUTLET FROM SAID BORE THEREBY DEFINING TWO CO-EXTENSIVE ANNULAR ORIFICES HAVING DIFFERENT CROSS-SECTIONAL AREAS BETWEEN SAID PLUNGER AND SAID CASING, THE LENGTHS OF WHICH ARE VARIED BY MOVEMENT OF SAID PLUNGER AXIALLY WHEREBY THE BACK-PRESSURE IN THE EXTRUDER AND THE DEGREE OF MATERIAL REFINING IS CONTROLLED DURING EXTRUSION OPERATION.
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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) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |