US3572418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for assembling molding flasks with sand cores
Assignee: Fritz Winter Eisengiesserei OHG
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Filing: 1968-05-03
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Granted: 1971-03-23
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Expires: 1988-05-03
Abstract
Abstract GREEN SAND CORES ARE FORMED IN LOWER PARTS OF CORE BOXES AND ARE THEREUPON PIVOTED THROUGH 90 DEGREES ABOUT HORIZONTAL AXES TO SETTING POSITIONS. THE UPPER HALVES OF THE LOWER CORE BOX PARTS ARE THEREUPON REMOVED AND THE DRAG OF A MOLDING FLASK IS PLACED OVER THE CORES. THE CORES ARE INVERTED WITH THE DRAG SO THAT THEIR PRINTS REST IN THE DRAG AND A COPE IS PLACED ON TOP OF THE DRAG.
Inventors
- 👤 Hans-Dieter Keller
- 👤 Horst Henkel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:31
CPC Classifications
B; B22; B22C; B22C13/00; B22C13/12; B22C11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |