Patent US3131433A successfully refreshed from Google Patents.
US3131433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection molding machine
Assignee: Individual
•
Filing: 1961-11-08
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Granted: 1964-05-05
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Expires: 1981-11-08
Abstract
No abstract record available.
Inventors
- 👤 Volland Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:56
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/47; B29C45/50; B29C45/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
IN AN INJECTION MOLDING MACHINE FOR THERMOPLASTIC MATERIAL, IN COMBINATION, A CYLINDER HAVING A BORE; A MATERIAL CONVEYING ELEMENT MOVABLY RECEIVED IN SAID BORE FOR ADVANCING THE MATERIAL THROUGH SAID CYLINDER, SAID CONVEYING ELEMENT HAVING A REAR STOP FACE AND A FRONT STOP FACE SPACED FROM AND LOCATED AT THE DOWNSTREAM SIDE OF SAID REAR STOP FACE; AND A REFLUX ELIMINATING ANNULAR MEMBER SLIDABLY RECEIVED IN SAID BORE INTERMEDIATE SAID STOP FACES, SAID ANNULAR MEMBER HAVING AN INTERNAL SURFACE DEFINING WITH SAID CONVEYING ELEMENT AT LEAST ONE DUCT FOR THE MATERIAL, A REAR END FACE ADAPTED TO ABUT AGAINST SAID REAR STOP FACE SO AS TO PREVENT THE FLOW OF MATERIAL TO SAID DUCT, AND A FRONT END FACE ADAPTED TO ABUT AGAINST SAID FRONT STOP FACE, THE DISTANCE BETWEEN SAID STOP FACES EXCEEDING THE DISTANCE BETWEEN SAID END FACES AND AT LEAST A PORTION OF SAID ANNULAR MEMBER CONSISTING OF ELASTICALLY DEFORMABLE MATERIAL SO THAT THE ANNULAR MEMBER MAY EXPAND INTO TIGHT SEALING ENGAGEMENT WITH SAID CYLINDER IN RESPONSE TO INCREASING PRESSURE OF THERMOPLASTIC MATERIAL IN SAID BORE AND SAID DUCT.
Claim 2
Dependent Claim
182 words
IN AN INJECTION MOLDING MACHINE FOR THERMOPLASTIC MATERIAL, IN COMBINATION, A CYLINDER HAVING A BORE; A MATERIAL CONVEYING ELEMENT MOVABLY RECEIVED IN SAID BORE FOR ADVANCING THE MATERIAL THROUGH SAID CYLINDER, SAID CONVEYING ELEMENT HAVING A REAR STOP FACE AND A FRONT STOP FACE SPACED FROM AND LOCATED AT THE DOWNSTREAM SIDE OF SAID REAR STOP FACE; AND A REFLUX ELIMINATING ANNULAR MEMBER SLIDABLY RECEIVED IN SAID BORE INTERMEDIATE SAID STOP FACES, SAID ANNULAR MEMBER HAVING AN INTERNAL SURFACE DEFINING WITH SAID CONVEYING ELEMENT AT LEAST ONE DUCT FOR THE MATERIAL, A REAR END FACE ADAPTED TO ABUT AGAINST SAID REAR STOP FACE SO AS TO PREVENT THE FLOW OF MATERIAL TO SAID DUCT, AND A FRONT END FACE ADAPTED TO ABUT AGAINST SAID FRONT STOP FACE, THE DISTANCE BETWEEN SAID STOP FACES EXCEEDING THE DISTANCE BETWEEN SAID END FACES AND AT LEAST A PORTION OF SAID ANNULAR MEMBER CONSISTING OF ELASTICALLY DEFORMABLE MATERIAL SO THAT THE ANNULAR MEMBER MAY EXPAND INTO TIGHT SEALING ENGAGEMENT WITH SAID CYLINDER IN RESPONSE TO INCREASING PRESSURE OF THERMOPLASTIC MATERIAL IN SAID BORE AND SAID DUCT.
References Cited (Backward Citations)
US2616130A
Cited
US2885734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |