Patent US3919870A successfully refreshed from Google Patents.
US3919870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cleaning tool parts in extruders
Assignee: Vodafone GmbH
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Filing: 1974-08-14
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Granted: 1975-11-18
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Expires: 1994-08-14
Abstract
Abstract The work or blank holder, die, mandrel and press punch or ram in an extrusion press are cleaned, particularly for removal of residue resulting from lubrication of the blank with glass prior to extrusion, in that a mica ring is placed between punch or ram and blank and extruded for most of its parts in the last phases of extruding that blank to obtain the cleaning. A left over portion of that ring is extruded ahead of extruding the next blank.
Inventors
- 👤 Johann Wassen
- 👤 Josef Hesse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:08
CPC Classifications
B; B21; B21C; B21C35/00; B21C35/06; B21C35/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
Method of cleaning a work holder, die, mandrel, and a press punch or ram of an extrusion press used for extruding a blank covered with a lubricant, comprising: placing a compressed mica disk, from which at least 90 percent of the water of crystallization has been removed, directly between the blank and the press punch or ram prior to extrusion, the disk being of annular configuration and engaging the work holder and the mandrel; and extruding the disks in the final phases of extrusion of the blank, so that only a small portion of the disk remains in front of the die, and remains therein to be extruded ahead of extrusion of the next blank, for which extrusion another mica disk is placed between the ram and the said next blank in the same manner as in the previous extrusion.
Claim 2
Dependent Claim
140 words
Method of cleaning a work holder, die, mandrel, and a press punch or ram of an extrusion press used for extruding a blank covered with a lubricant, comprising: placing a compressed mica disk, from which at least 90 percent of the water of crystallization has been removed, directly between the blank and the press punch or ram prior to extrusion, the disk being of annular configuration and engaging the work holder and the mandrel; and extruding the disks in the final phases of extrusion of the blank, so that only a small portion of the disk remains in front of the die, and remains therein to be extruded ahead of extrusion of the next blank, for which extrusion another mica disk is placed between the ram and the said next blank in the same manner as in the previous extrusion.
References Cited (Backward Citations)
US2893555A
Cited
US3097742A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |