Patent US2895838A successfully refreshed from Google Patents.
US2895838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal casting mold material
Assignee: Diamond Shamrock Corp
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Filing: 1956-09-05
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Granted: 1959-07-21
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Expires: 1976-09-05
Abstract
No abstract record available.
Inventors
- 👤 Frank P Henda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 01:54
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/18; B22C1/185; B22C1/186; B22C1/188; C; C04; C04B; C04B28/00; C04B28/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
THE METHOD OF FORMING A METAL CASTING MOLD WHICH COMPRISES PLACING IN CONTACT WITH A CASTING-DEFINING SURFACE AN INTIMATE MIXTURE OF A MAJOR PROPORTION OF A FINELY-DIVIDED REFRACTORY MATERIAL, A MINOR AMOUNT OF A PHOSPHATE COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL PHOSPHATES, ALKALINE EARTH METAL PHOSPHATES, AMMONIUM PHOSPHATES AND TRIARYL PHOSPHATES, THE AMOUNT OF SAID PHOSPHATE COMPOUND BEING AT LEAST SUFFICIENT TO PROVIDE MOLD COLLAPSIBILITY AFTER CASTING AND NOT GREATER THAN ABOUT 5% BY WEIGHT OF SAID REFRACTORY, ABOUT 3 TO 15% BY WEIGHT OF SAID REFRACTORY OF AN ALKALI METAL SILICATE BINDER, AND IMPREGNATING THIS MIXTURE WITH A REACTANT CAPABLE OF THE MIXTURE.
Claim 2
Independent Claim
107 words
THE METHOD OF FORMING A METAL CASTING MOLD WHICH COMPRISES PLACING IN CONTACT WITH A CASTING-DEFINING SURFACE AN INTIMATE MIXTURE OF A MAJOR PROPORTION OF A FINELY-DIVIDED REFRACTORY MATERIAL, A MINOR AMOUNT OF A PHOSPHATE COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL PHOSPHATES, ALKALINE EARTH METAL PHOSPHATES, AMMONIUM PHOSPHATES AND TRIARYL PHOSPHATES, THE AMOUNT OF SAID PHOSPHATE COMPOUND BEING AT LEAST SUFFICIENT TO PROVIDE MOLD COLLAPSIBILITY AFTER CASTING AND NOT GREATER THAN ABOUT 5% BY WEIGHT OF SAID REFRACTORY, ABOUT 3 TO 15% BY WEIGHT OF SAID REFRACTORY OF AN ALKALI METAL SILICATE BINDER, AND IMPREGNATING THIS MIXTURE WITH A REACTANT CAPABLE OF THE MIXTURE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-20 | 1963-01-19 | 1963-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-20 | 1967-01-19 | 1967-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-20 | 1971-01-19 | 1971-07-21 | $7700.00 | Window Closed / Lapsed |