Patent US2928749A successfully refreshed from Google Patents.
US2928749A
Expired / Lapsed
US
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Investment material for precision casting
Assignee: Pre-Vest Inc
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Filing: 1956-12-12
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Granted: 1960-03-15
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Expires: 1976-12-12
Abstract
No abstract record available.
Inventors
- 👤 Claude H Watts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:21
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/18; B22C1/186; B22C1/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A REFRACTORY INVESTMENT CONSISTING ESSENTIALLY OF THE REACTION PRODUCTS OF 21 PARTS BY VOLUME OF A BINDER CONSISTING OF THE FOLLOWING 100 PARTS LIQUID: 10 PARTS BY VOLUME SODIUM SILICATE, SPECIFIC GRAVITY 1.32 (6.75% SODIUM OXIDE TO 25.3% SILICON DIOXIDE) 12 PARTS BY VOLUME ORTHO PHOSPHORIC ACID 85%, SPECIFIC GRAVITY 1.71 78 PARTS BY VOLUME WATER AND FOUR GRAMS OF FUSED MAGNESIUM OXIDE FOR EACH 21 CC. OF BINDER, THE BINDER MIXED WITH GRADED REFRACTORY SUBSTANTIALLY INERT TO RAPID REACTION WITH THE BALANCE OF THE INGREDIENTS AND THEIR REACTION PRODUCTS.
Claim 2
Dependent Claim
90 words
A REFRACTORY INVESTMENT CONSISTING ESSENTIALLY OF THE REACTION PRODUCTS OF 21 PARTS BY VOLUME OF A BINDER CONSISTING OF THE FOLLOWING 100 PARTS LIQUID: 10 PARTS BY VOLUME SODIUM SILICATE, SPECIFIC GRAVITY 1.32 (6.75% SODIUM OXIDE TO 25.3% SILICON DIOXIDE) 12 PARTS BY VOLUME ORTHO PHOSPHORIC ACID 85%, SPECIFIC GRAVITY 1.71 78 PARTS BY VOLUME WATER AND FOUR GRAMS OF FUSED MAGNESIUM OXIDE FOR EACH 21 CC. OF BINDER, THE BINDER MIXED WITH GRADED REFRACTORY SUBSTANTIALLY INERT TO RAPID REACTION WITH THE BALANCE OF THE INGREDIENTS AND THEIR REACTION PRODUCTS.
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) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |