Patent US3241185A successfully refreshed from Google Patents.
US3241185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruder with means to vary ram pressure
Assignee: Williams White and Co
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Filing: 1963-07-22
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Granted: 1966-03-22
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Expires: 1983-07-22
Abstract
No abstract record available.
Inventors
- 👤 Richard A Hufford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:35
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/325; B29C48/03; B29C48/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN AN EXTRUSION MACHINE INCLUDING AN ACCUMULATOR, A DIE HEAD, AN ACCUMULATOR RAN FOR EXPELLING PLASTIC POLYMER FROM SAID ACCUMULATOR THROUGH SAID DIE HEAD TO FORM A PARISON, AND A HYDRAULIC SYSTEM FOR ADVANCING SAID RAM INTO SAID ACCUMULATOR INCLUDING A CONSTANT PRESSURE PUMP, A HYDRAULIC CYLINDER, AND A DUCT CONNECTING SAID PUMP AND SAID CYLINDER, A CONTINUOUSLY VARIABLE ACCUMULATOR PRESSURE CONTROL COMPRISING MEANS DEFINING A PRESSURE RELIEF PORT INSAID SYSTEM,VALVE MEANS NORMALLY CLOSING SAID PORT, AND A REMOTE, CONTINUOUSLY ADJUSTABLE, HYDRAULIC PRESSURE RELIEF VALVE HYDRAULICALLY CONNECTED TO SAID VALVE MEAN TO CAUSE SAID VALVE MEANS TO OPEN UPON THE ATTAINMENT OF A PARTICULAR PRESSURE IN SAID SYSTEM DETERMINED BY THE ADJUSTMENT OF SAID VALVE.
Claim 2
Dependent Claim
115 words
IN AN EXTRUSION MACHINE INCLUDING AN ACCUMULATOR, A DIE HEAD, AN ACCUMULATOR RAN FOR EXPELLING PLASTIC POLYMER FROM SAID ACCUMULATOR THROUGH SAID DIE HEAD TO FORM A PARISON, AND A HYDRAULIC SYSTEM FOR ADVANCING SAID RAM INTO SAID ACCUMULATOR INCLUDING A CONSTANT PRESSURE PUMP, A HYDRAULIC CYLINDER, AND A DUCT CONNECTING SAID PUMP AND SAID CYLINDER, A CONTINUOUSLY VARIABLE ACCUMULATOR PRESSURE CONTROL COMPRISING MEANS DEFINING A PRESSURE RELIEF PORT INSAID SYSTEM,VALVE MEANS NORMALLY CLOSING SAID PORT, AND A REMOTE, CONTINUOUSLY ADJUSTABLE, HYDRAULIC PRESSURE RELIEF VALVE HYDRAULICALLY CONNECTED TO SAID VALVE MEAN TO CAUSE SAID VALVE MEANS TO OPEN UPON THE ATTAINMENT OF A PARTICULAR PRESSURE IN SAID SYSTEM DETERMINED BY THE ADJUSTMENT OF SAID VALVE.
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) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |