US3002948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shell mold
Assignee: American Steel Foundries
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Filing: 1957-09-12
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Granted: 1961-10-03
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Expires: 1977-09-12
Abstract
No abstract record available.
Inventors
- 👤 William D Lawther
- 👤 John A Rassenfoss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:44
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A SHELL MOLD FOR PRODUCING LOW CARBON, LOW ALLOY STEEL CASTINGS, SAID MOLD COMPRISING: MOLDING-SAND PARTICLES BONDED TOGETHER BY A PHENOL FORMALDEHYDE RESIN AND HAVING A SUFFICIENT AMOUNT OF THE EARTHY RESIDUE RESULTING FROM THE DIGESTION OF BAUXITE AT THE CASTING CONTACTING MOLD SURFACES TO EFFECTIVELY ELIMINATE CHARACTERISTIC SHELL MOLDING DEFECTS OF CASTINGS POURED THEREIN, SAID RESIDUE COMPRISING IN CHEMICAL COMBINATION THE FOLLOWING CONSTITUENTS IN APPROXIMATELY THE PERCENTAGES INDICATED: AL2O3, 26%, FE2O3, 17%, SIO2, 14%, TIO2, 11%, CAO 10%, NA2O, 10%, THE BALANCE IGNITION LOSS.
Claim 2
Dependent Claim
85 words
A SHELL MOLD FOR PRODUCING LOW CARBON, LOW ALLOY STEEL CASTINGS, SAID MOLD COMPRISING: MOLDING-SAND PARTICLES BONDED TOGETHER BY A PHENOL FORMALDEHYDE RESIN AND HAVING A SUFFICIENT AMOUNT OF THE EARTHY RESIDUE RESULTING FROM THE DIGESTION OF BAUXITE AT THE CASTING CONTACTING MOLD SURFACES TO EFFECTIVELY ELIMINATE CHARACTERISTIC SHELL MOLDING DEFECTS OF CASTINGS POURED THEREIN, SAID RESIDUE COMPRISING IN CHEMICAL COMBINATION THE FOLLOWING CONSTITUENTS IN APPROXIMATELY THE PERCENTAGES INDICATED: AL2O3, 26%, FE2O3, 17%, SIO2, 14%, TIO2, 11%, CAO 10%, NA2O, 10%, THE BALANCE IGNITION LOSS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-02 | 1965-04-03 | 1965-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-02 | 1969-04-03 | 1969-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-02 | 1973-04-03 | 1973-10-03 | $7700.00 | Window Closed / Lapsed |