Patent US3213662A successfully refreshed from Google Patents.
US3213662A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formation of hollow articles by extrusion
Assignee: Rio Tinto Switzerland AG
•
Filing: 1963-07-18
•
Granted: 1965-10-26
•
Expires: 1983-07-18
Abstract
No abstract record available.
Inventors
- 👤 Lenz Dieter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:07
CPC Classifications
B; B21; B21C; B21C23/00; B21C23/02; B21C23/04; B21C23/08; B21C23/085; B21C23/21; B21C23/217; B21C25/00; B21C25/04; B21C27/00; B21C27/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A MACHINE FOR FORMING HOLLOW ARTICLES BY EXTRUSION COMPRISING AN EXTRUSION DIE, A CORE FOR DEFINING THE SHAPE OF THE CAVITIES IN THE SECTION OF THE PROFILE TO BE EXTRUDED, MEANS FOR SECURING SAID CORE IN POSITION AND COMPRISING WEBS CONNECTED TO SAID CORE AND DEFINING SPACES THEREBETWEEN FOR THE PASSAGE OF THE MATERIAL TO BE EXTRUDED THERETHROUGH, A MANDREL EXTENDING REARWARDLY FROM THE CORE AND SHIELDING THE CENTRAL PART OF THE REAR SURFACE OF THE CORE TO RELEIVE THE PRESSURE OF THE MATERIAL ON THE CORE DURING EXTRUSION, THE FORWARD SHIELDING END OF SAID MANDREL BEING SEPARABLE FROM SAID CORE TO PERMIT INTERCHANGE OF MANDREL SHIELDING ENDS ACCORDING TO THE SHAPE OF THE PROFILE TO BE EXTRUDED, AND AN EXTRUSION ARM INDEPENDENT OF SAID MANDREL AND ARRANGED TO FORCE A TUBULAR BILLET OF THE MATERIAL SURROUNDING THE MANDREL AXIALLY ALONG THE MANDREL, AROUND THE CORE AND THROUGH THE DIE.
Claim 2
Dependent Claim
150 words
A MACHINE FOR FORMING HOLLOW ARTICLES BY EXTRUSION COMPRISING AN EXTRUSION DIE, A CORE FOR DEFINING THE SHAPE OF THE CAVITIES IN THE SECTION OF THE PROFILE TO BE EXTRUDED, MEANS FOR SECURING SAID CORE IN POSITION AND COMPRISING WEBS CONNECTED TO SAID CORE AND DEFINING SPACES THEREBETWEEN FOR THE PASSAGE OF THE MATERIAL TO BE EXTRUDED THERETHROUGH, A MANDREL EXTENDING REARWARDLY FROM THE CORE AND SHIELDING THE CENTRAL PART OF THE REAR SURFACE OF THE CORE TO RELEIVE THE PRESSURE OF THE MATERIAL ON THE CORE DURING EXTRUSION, THE FORWARD SHIELDING END OF SAID MANDREL BEING SEPARABLE FROM SAID CORE TO PERMIT INTERCHANGE OF MANDREL SHIELDING ENDS ACCORDING TO THE SHAPE OF THE PROFILE TO BE EXTRUDED, AND AN EXTRUSION ARM INDEPENDENT OF SAID MANDREL AND ARRANGED TO FORCE A TUBULAR BILLET OF THE MATERIAL SURROUNDING THE MANDREL AXIALLY ALONG THE MANDREL, AROUND THE CORE AND THROUGH THE DIE.
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) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |