US3140332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection molding method and apparatus
Assignee: Lombard Industries Inc
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Filing: 1961-03-01
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Granted: 1964-07-07
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Expires: 1981-03-01
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:22
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/47; B29C45/50; B29C45/5008; B29C2045/5088; B29C2045/5096
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
219 words
THE METHOD OF MANIPULATING AN INJECTION MOLDING MACHINE OF THE TYPE HAVING A SCREW ROTATABLE AND SLIDABLE IN A CYLINDER FITTED WITH AN OPEN NOZZLE FOLLOWING ONE AND IN PREPARATION OF THE NEXT INJECTION OF THE PLASTIC CHARGE INTO THE MOLD, WHICH COMPRISES POSITIONING SAID NOZZLE AGAINST THE MOLD TO ESTABLISH IN SAID CYLINDER AND BETWEEN SAID MOLD AND SAID SCREW A PREDETERMINED CHARGE PREPARING CHAMBER VOLUME, FEEDING PLASTIC MATERIAL TO SAID SCREW AND ROTATING IT WHILE HEATING SAID CYLINDER TO DELIVER THE PLASTIC MATERIAL TO SAID CHAMBER AT A PREDETERMINED CHARGE PREPARING TEMPERATURE, STOPPING THE REARWARD MOVEMENT OF SAID SCREW COMPELLED BY DELIVERY OF SAID MATERIAL WHEN SAID CHAMBER HAS REACHED SAID PREDETERMINED VOLUME, CONTINUNING THE ROTATION OF SAID SCREW WHILE HOLDING IT AGAINST FURTHER RETRACTION TO BRING THE PLASTIC MATERIAL IN SAID CHAMBER VOLUME TO A PREDETERMINED CHARGE PRESSURE, THEREUPON STOPPING ROTATION OF AND ALLOWING RETRACTION OF SAID SCREW A PREDETERMINED AMOUNT TO INCREASE THE CHAMBER VOLUME AND DECREASE THE MATERIAL JPRESS URE TO A POINT AT WHICH THAT WILL NOT FLOW OUT THROUGH THE NOZZLE WHEN THE MOLD IS OPENED TO REMOVE THE ARTICLE MOLDED FROM THE PREVIOUS CHARGE, AND UPON THE RECLOSING OF SAID MOLD ADVANCING SAID SCREW TO FORCE SAID MATERIAL OUT OF SAID CHAMBER AND INTO SAID MOLD UNDER DESIRED PRESSURE AND TEMPERATURE.
Claim 2
Independent Claim
219 words
THE METHOD OF MANIPULATING AN INJECTION MOLDING MACHINE OF THE TYPE HAVING A SCREW ROTATABLE AND SLIDABLE IN A CYLINDER FITTED WITH AN OPEN NOZZLE FOLLOWING ONE AND IN PREPARATION OF THE NEXT INJECTION OF THE PLASTIC CHARGE INTO THE MOLD, WHICH COMPRISES POSITIONING SAID NOZZLE AGAINST THE MOLD TO ESTABLISH IN SAID CYLINDER AND BETWEEN SAID MOLD AND SAID SCREW A PREDETERMINED CHARGE PREPARING CHAMBER VOLUME, FEEDING PLASTIC MATERIAL TO SAID SCREW AND ROTATING IT WHILE HEATING SAID CYLINDER TO DELIVER THE PLASTIC MATERIAL TO SAID CHAMBER AT A PREDETERMINED CHARGE PREPARING TEMPERATURE, STOPPING THE REARWARD MOVEMENT OF SAID SCREW COMPELLED BY DELIVERY OF SAID MATERIAL WHEN SAID CHAMBER HAS REACHED SAID PREDETERMINED VOLUME, CONTINUNING THE ROTATION OF SAID SCREW WHILE HOLDING IT AGAINST FURTHER RETRACTION TO BRING THE PLASTIC MATERIAL IN SAID CHAMBER VOLUME TO A PREDETERMINED CHARGE PRESSURE, THEREUPON STOPPING ROTATION OF AND ALLOWING RETRACTION OF SAID SCREW A PREDETERMINED AMOUNT TO INCREASE THE CHAMBER VOLUME AND DECREASE THE MATERIAL JPRESS URE TO A POINT AT WHICH THAT WILL NOT FLOW OUT THROUGH THE NOZZLE WHEN THE MOLD IS OPENED TO REMOVE THE ARTICLE MOLDED FROM THE PREVIOUS CHARGE, AND UPON THE RECLOSING OF SAID MOLD ADVANCING SAID SCREW TO FORCE SAID MATERIAL OUT OF SAID CHAMBER AND INTO SAID MOLD UNDER DESIRED PRESSURE AND TEMPERATURE.
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) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |