Pressure casting process
Abstract
Abstract A PRESSURE CASTING APPARATUS FOR CASTING HIGHLY VISCOUS MATERIAL HAVING A CASTING MOLD WITHIN A VACUUM BELL, WHEREBY THE VACUUM PREVENTS VOIDS IN THE CAST MATERIAL AND REDUCES THE PRESSURIZATION OTHERWISE REQUIRED ON A TRANSFER POT CONTAINING THE MATERIAL TO BE CAST. THE TRANSFER POT IS OPERABLY CONNECTED TO A PRESSURE CASTING HEAD HAVING PATTERN HOLES IN THE BOTTOM THEREOF, WHICH CASTING HEAD FORMS THE TOP OF THE VACUUM BELL ABOVE THE CASTING MOLD. THE CASTING PROCESS IS PERFORMED BY DRAWING A VACUUM IN THE BELL, PRESSURIZING THE TRANSFER POT, FORCING THE MATERIAL FROM THE TRANSFER POT THROUGH THE CASTING HEAD, AND DROPPING THE EXTRUDED MATERIAL INTO THE CASTING MOLD FOR CURING.
Inventors
- 👤 Lloyd A Walker
- 👤 Rudolph A Peterson
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |