Patent US2806270A successfully refreshed from Google Patents.
US2806270A
Expired / Lapsed
US
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Method of making moulds for precision casting
Assignee: Rolls Royce PLC
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Filing: 1954-07-12
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Granted: 1957-09-17
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Expires: 1974-07-12
Abstract
No abstract record available.
Inventors
- 👤 Shaul Basil James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:12
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/165
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
THE METHOD OF FORMING A MULTI-LAYER SHELL MOULD AROUND AN EXPENDABLE PATTERN WHICH INCLUDES PREPARING TWO SOLUTIONS OF A SOLUBLE SILICATE OF WHICH IN AT LEAST ONE OF THE SOLUTIONS THE SILICATE IS SELECTED FROM THE GROUP CONSISITNG OF ETHYL AND POTASSIUM, EACH CONTAINING A FINELY GROUND REFRACTORY MATERIAL SUSPENDED THEREIN AND ONE BEING ALKALINE AND THE OTHER HAVING AN ACID MATERIAL ADDED TO MAKE THE SAME ACID BUT OF A NORMALITY LESS THAN THE NORMALITY OF THE ALKALINE SOLUTION, AND THEN DIPPING THE PATTERN REPEATEDLY ALTERNATELY IN THE ACID AND THEN IN THE ALKALINE SOLUTION WHILE THE ACID SOLUTION IS STILL WET THEREON AND APPLYING A STUCCO MATERIAL TO THE WET SHELL AFTER EACH DIPPING.
Claim 2
Independent Claim
116 words
THE METHOD OF FORMING A MULTI-LAYER SHELL MOULD AROUND AN EXPENDABLE PATTERN WHICH INCLUDES PREPARING TWO SOLUTIONS OF A SOLUBLE SILICATE OF WHICH IN AT LEAST ONE OF THE SOLUTIONS THE SILICATE IS SELECTED FROM THE GROUP CONSISITNG OF ETHYL AND POTASSIUM, EACH CONTAINING A FINELY GROUND REFRACTORY MATERIAL SUSPENDED THEREIN AND ONE BEING ALKALINE AND THE OTHER HAVING AN ACID MATERIAL ADDED TO MAKE THE SAME ACID BUT OF A NORMALITY LESS THAN THE NORMALITY OF THE ALKALINE SOLUTION, AND THEN DIPPING THE PATTERN REPEATEDLY ALTERNATELY IN THE ACID AND THEN IN THE ALKALINE SOLUTION WHILE THE ACID SOLUTION IS STILL WET THEREON AND APPLYING A STUCCO MATERIAL TO THE WET SHELL AFTER EACH DIPPING.
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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) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |