US2861893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foundry cores
Assignee: BRUMLEY DONAIDSON CO
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Filing: 1956-05-25
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Granted: 1958-11-25
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Expires: 1976-05-25
Abstract
No abstract record available.
Inventors
- 👤 Frank S Brewster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:33
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A BINDER FOR MAKING STABLE FOUNDRY CORES, COMPRISING: 80% TO 87% BY WEIGHT OF A HYDROUS, WATER DISPERSIBLE SODIUM SILICATE SOLUTION AND 13% TO 20% OF SUCROSE DISSOLVED IN SAID SILICATE SOLUTION, SAID SILICATE SOLUTION CONTAINING BETWEEN 40% AND 60% OF A SODIUM SILICATE HAVING ONE PART NA2O TO EACH 2.0 TO 3.22 PARTS SIO2; SAID BINDER, UPON BEING ADDED TO FOUNDRY SAND IN THE PROPORTION OF FROM 3% TO 7% OF SAID BINDER TO 93% TO 97% OF FOUNDRY CORE SAND, PRODUCING A COMPOSITION WHICH READILY POURS AND FLOWS INTO MOLDS, HARDENS INTO STABLE CORES HAVING A COMPRESSION STRENGTH OF OVER 250 P. S. I. UPON EXPOSURE TO CARBON DIOXIDE AND WITHOUT BAKING, AND SUCH HARDENED CORES MAINTAINING HIGH STRENGTH AND STABILITY AT TEMPERATURES UP TO ABOUT 2000* F. AND THEN BECOME READILY DISINTEGRATABLE.
Claim 2
Dependent Claim
135 words
A BINDER FOR MAKING STABLE FOUNDRY CORES, COMPRISING: 80% TO 87% BY WEIGHT OF A HYDROUS, WATER DISPERSIBLE SODIUM SILICATE SOLUTION AND 13% TO 20% OF SUCROSE DISSOLVED IN SAID SILICATE SOLUTION, SAID SILICATE SOLUTION CONTAINING BETWEEN 40% AND 60% OF A SODIUM SILICATE HAVING ONE PART NA2O TO EACH 2.0 TO 3.22 PARTS SIO2; SAID BINDER, UPON BEING ADDED TO FOUNDRY SAND IN THE PROPORTION OF FROM 3% TO 7% OF SAID BINDER TO 93% TO 97% OF FOUNDRY CORE SAND, PRODUCING A COMPOSITION WHICH READILY POURS AND FLOWS INTO MOLDS, HARDENS INTO STABLE CORES HAVING A COMPRESSION STRENGTH OF OVER 250 P. S. I. UPON EXPOSURE TO CARBON DIOXIDE AND WITHOUT BAKING, AND SUCH HARDENED CORES MAINTAINING HIGH STRENGTH AND STABILITY AT TEMPERATURES UP TO ABOUT 2000* F. AND THEN BECOME READILY DISINTEGRATABLE.
References Cited (Backward Citations)
US1091690A
Cited
US1247595A
Cited
US2143930A
Cited
FR912875A
Cited
GB710099A
Cited
US2748435A
Cited
GB745402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |