US3226769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic control systems for injection molding machines
Assignee: Molins Machine Co Ltd
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Filing: 1963-06-11
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Granted: 1966-01-04
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Expires: 1983-06-11
Abstract
No abstract record available.
Inventors
- 👤 Williamson David Theodo Nelson
- 👤 Orloff George
- 👤 Barber Donald John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:38
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/76; B29C45/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN AN INJECTION MOULDING MACHINE TWO HALF MOULDS, A FLUID OPERATED CLAMPING CYLINDER TO CLOSE THE TWO HALF MOULDS FORMING A MOULD CAVITY, A FLUID OPERATED INJECTION CYCLINDER TO INJECT PLASTIC MATERIAL INTO THE MOLD CAVITY, A HIGH-PRESSURE FLUID SOURCE COMMUNICATING WITH SAID CYLINDERS, A REDUCING VALVE TO REDUCE FLUID PRESSURE BETWEEN SAID SOURCE AND THE CLAMPING CYLINDER, PRESSURE MEANS RESPONSIVE TO THE PRESSURE DEVELOPED IN SAID MOULD CAVITY BY SAID PLASTIC MATERIAL, A MULTIPLIER RESPONSIVE TO SAID PRESSURE MEANS AND TO THE SIZE OF SAID MOULD CAVITY TO PRODUCE A RESULTANT FORCE ACTING ON SAID REDUCING VALVE, THE OUTPUT PRESSURE FROM WHICH IS PROPORTIONAL TO SAID RESULTANT FORCE.
Claim 2
Dependent Claim
109 words
IN AN INJECTION MOULDING MACHINE TWO HALF MOULDS, A FLUID OPERATED CLAMPING CYLINDER TO CLOSE THE TWO HALF MOULDS FORMING A MOULD CAVITY, A FLUID OPERATED INJECTION CYCLINDER TO INJECT PLASTIC MATERIAL INTO THE MOLD CAVITY, A HIGH-PRESSURE FLUID SOURCE COMMUNICATING WITH SAID CYLINDERS, A REDUCING VALVE TO REDUCE FLUID PRESSURE BETWEEN SAID SOURCE AND THE CLAMPING CYLINDER, PRESSURE MEANS RESPONSIVE TO THE PRESSURE DEVELOPED IN SAID MOULD CAVITY BY SAID PLASTIC MATERIAL, A MULTIPLIER RESPONSIVE TO SAID PRESSURE MEANS AND TO THE SIZE OF SAID MOULD CAVITY TO PRODUCE A RESULTANT FORCE ACTING ON SAID REDUCING VALVE, THE OUTPUT PRESSURE FROM WHICH IS PROPORTIONAL TO SAID RESULTANT FORCE.
References Cited (Backward Citations)
US2481991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |