Patent US2847741A successfully refreshed from Google Patents.
US2847741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making washed shell mold
Assignee: American Steel Foundries
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Filing: 1954-11-29
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Granted: 1958-08-19
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Expires: 1974-11-29
Abstract
No abstract record available.
Inventors
- 👤 Donald E Meves
- 👤 William D Lawther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:45
CPC Classifications
B; B22; B22C; B22C3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A METHOD OF PRODUCING LOW CARBON, LOW ALLOY STEEL CASTINGS COMPRISING MAKING A SHELL MOLD HAVING SAND PARTICLES BONDED TOGETHER BY A THERMO-SETTING RESIN, SAID MOLD HAVING A POROUS SURFACE DEFINIGN A CONTROUR OF A CASTING TO BE FORMED IN SAID MOLD, THEN FORMING A LAYER ON SAID SURFACE PENETRATING THE PORES THEREOF TO A DEPTH OF AT LEAST 1/04 OF AN INCH AND DEFINING A COATING ON SAID SURFACE NOT SUBSTANTIALLY IN EXCESS OF 20 MICRONS, SAID LAYER BEING FORMED OF PARTICLES CONSISTING OF ONE OR MORE OF THE GROUP OF TITANIUM DIOXIDE, MANGANESE DIOXIDE AND CERIUM OXIDE, SAID PARTICLES BEING CHEMICALLY INACTIVE WITH RESPECT TO SAID SURFACE IN THE PRESENCE OF SAID STEEL IN THE MOLTEN STATE AND HAVING A PARTICLE SIZE NOT SUBSTANTIALLY IN EXCESS OF 1 MICRON AND THEN FILLING SAID MOLD WITH SAID MOLTEN STEEL.
Claim 2
Independent Claim
140 words
A METHOD OF PRODUCING LOW CARBON, LOW ALLOY STEEL CASTINGS COMPRISING MAKING A SHELL MOLD HAVING SAND PARTICLES BONDED TOGETHER BY A THERMO-SETTING RESIN, SAID MOLD HAVING A POROUS SURFACE DEFINIGN A CONTROUR OF A CASTING TO BE FORMED IN SAID MOLD, THEN FORMING A LAYER ON SAID SURFACE PENETRATING THE PORES THEREOF TO A DEPTH OF AT LEAST 1/04 OF AN INCH AND DEFINING A COATING ON SAID SURFACE NOT SUBSTANTIALLY IN EXCESS OF 20 MICRONS, SAID LAYER BEING FORMED OF PARTICLES CONSISTING OF ONE OR MORE OF THE GROUP OF TITANIUM DIOXIDE, MANGANESE DIOXIDE AND CERIUM OXIDE, SAID PARTICLES BEING CHEMICALLY INACTIVE WITH RESPECT TO SAID SURFACE IN THE PRESENCE OF SAID STEEL IN THE MOLTEN STATE AND HAVING A PARTICLE SIZE NOT SUBSTANTIALLY IN EXCESS OF 1 MICRON AND THEN FILLING SAID MOLD WITH SAID MOLTEN STEEL.
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) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |