Patent US2752257A successfully refreshed from Google Patents.
US2752257A
Expired / Lapsed
US
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Investment molding
Assignee: Motors Liquidation Co
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Filing: 1952-11-15
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Granted: 1956-06-26
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Expires: 1972-11-15
Abstract
No abstract record available.
Inventors
- 👤 James P Bradley
- 👤 Robert R Dohrmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:27
CPC Classifications
B; B22; B22C; B22C3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A DIP COAT FOR APPLICATION TO A DESTRUCTIBLE PATTERN TO BE INVESTED IN A REFRACTORY MOLD, SAID DIP COAT CONSISTING ESSENTIALLY, BY WEIGHT, OF APPROXIMATELY 15% TO 30% OF AN AIRSETTING SILICATE CEMENT, 35% TO 70% SILICA FLOUR, 15% TO 35% WATER, SODIUM SILICATE NOT IN EXCESS OF 7%, 0.1% TO 0.3% DRY WETTING AGENT, 0.1% TO 1% OCTYL ALCOHOL, GLYCERINE NOT IN EXCESS OF 2%, 0.1% TO 0.4% ANIMAL GELATINE, AND AN ACID NOT IN EXCESS OF 0.3%.
Claim 2
Dependent Claim
79 words
A DIP COAT FOR APPLICATION TO A DESTRUCTIBLE PATTERN TO BE INVESTED IN A REFRACTORY MOLD, SAID DIP COAT CONSISTING ESSENTIALLY, BY WEIGHT, OF APPROXIMATELY 15% TO 30% OF AN AIRSETTING SILICATE CEMENT, 35% TO 70% SILICA FLOUR, 15% TO 35% WATER, SODIUM SILICATE NOT IN EXCESS OF 7%, 0.1% TO 0.3% DRY WETTING AGENT, 0.1% TO 1% OCTYL ALCOHOL, GLYCERINE NOT IN EXCESS OF 2%, 0.1% TO 0.4% ANIMAL GELATINE, AND AN ACID NOT IN EXCESS OF 0.3%.
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) | 1959-06-26 | 1959-12-26 | 1960-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-26 | 1963-12-26 | 1964-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-26 | 1967-12-26 | 1968-06-26 | $7700.00 | Window Closed / Lapsed |