US2842444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming moulds for precision casting
Assignee: Rolls Royce PLC
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Filing: 1954-07-19
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Granted: 1958-07-08
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Expires: 1974-07-19
Abstract
No abstract record available.
Inventors
- 👤 Emblem Harold Garton
- 👤 Cloherty Desmond Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:06
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/18; B22C1/183
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
THE METHOD OF FORMING A MOULD FOR PRECISION CASTING WHICH INCLUDES ADDING AN AQUEOUS SOLUTION OF AN ALKALI METAL SILICATE TO AN EXCESS OF AN AQUEOUS SOLUTION OF A MINERAL ACID, MIXING WITH THE RESULTANT ACID REACTION PRODUCTS SO FORMED A STABLE SUBSTANTIALLY ELECTROLYTE FREE COLLOIDAL DISPERSION OF SILICA IN WATER ALONG AND USING THE RESULTANT LIQUID TO BIND A REFRACTORY MOULD MATERIAL.
Claim 2
Independent Claim
63 words
THE METHOD OF FORMING A MOULD FOR PRECISION CASTING WHICH INCLUDES ADDING AN AQUEOUS SOLUTION OF AN ALKALI METAL SILICATE TO AN EXCESS OF AN AQUEOUS SOLUTION OF A MINERAL ACID, MIXING WITH THE RESULTANT ACID REACTION PRODUCTS SO FORMED A STABLE SUBSTANTIALLY ELECTROLYTE FREE COLLOIDAL DISPERSION OF SILICA IN WATER ALONG AND USING THE RESULTANT LIQUID TO BIND A REFRACTORY MOULD MATERIAL.
References Cited (Backward Citations)
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US2701902A
Cited
US2601235A
Cited
US2524358A
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US2680890A
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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) | 1961-07-07 | 1962-01-06 | 1962-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-07 | 1966-01-06 | 1966-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-07 | 1970-01-06 | 1970-07-08 | $7700.00 | Window Closed / Lapsed |