Patent US3587709A successfully refreshed from Google Patents.
US3587709A
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US
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Foundry sand forming method
Assignee: Sherwin Williams Co
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Filing: 1969-03-10
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Granted: 1971-06-28
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Expires: 1989-03-10
Abstract
Abstract A FOUNDRY MOLDING PROCESS AND MACHINE FOR PRODUCING MOLDS OR CORES FROM A SAND RESIN MIX BY BLOWING THE SAME INTO A PATTERNED BOX AND USING A LOW TEMPERATURE CURE ACCELERATOR SUCH AS WARM AIR WHICH IS PERMEATED THROUGH THE SAND ARTICLE THROUGH THE BOX BLOW VENTS AND WHICH IS EXHAUSTED THROUGH AN EXHAUST PORT OF A PRESSURE PAD CLAMPED OVER THE BOX. D R A W I N G
Inventors
- 👤 Leon F Miller
- 👤 Henry J Herbruggen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:48
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/12; B22C9/123; B22C15/00; B22C15/23; B22C15/24
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |