US2806269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moulds for precision casting
Assignee: Rolls Royce PLC
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Filing: 1953-08-24
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Granted: 1957-09-17
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Expires: 1973-08-24
Abstract
No abstract record available.
Inventors
- 👤 Dunlop Adam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:29
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/165
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
THE METHOD OF FORMING A MULTI-LAYER SHELL MOULD AROUND AN EXPENDABLE PATTERN WHICH INCLUDES PREPARING TWO SOLUTIONS OF SODIUM SILICATE EACH CONTAINING A FINELY GROUND REFRACTORY MATERIAL SUSPENDED THEREIN AND ONE BEING ALKALINE AND THE OTHER HAVING AN ACID MATERIAL ADDING TO MAKE THE SAME ACID BUT OF A NORMALITY LESS THAN THE NORMALLY OF THE ALKALINE SOLUTION, AND THEN APPLYING TO THE PATTERN ALTERNATELY THE ACID AND THE ALKALINE SOLUTION AND STUCCOING A FINELY GROUND REFACTORY MATERIAL TO THE WET SHELL AFTER EACH APPLICATION, SAID ALKALINE SOLUTION ALWAYS BEING APPLIED WHILE THE SHELL IS STILL WET WITH SAID ACID SOLUTION.
Claim 2
Independent Claim
101 words
THE METHOD OF FORMING A MULTI-LAYER SHELL MOULD AROUND AN EXPENDABLE PATTERN WHICH INCLUDES PREPARING TWO SOLUTIONS OF SODIUM SILICATE EACH CONTAINING A FINELY GROUND REFRACTORY MATERIAL SUSPENDED THEREIN AND ONE BEING ALKALINE AND THE OTHER HAVING AN ACID MATERIAL ADDING TO MAKE THE SAME ACID BUT OF A NORMALITY LESS THAN THE NORMALLY OF THE ALKALINE SOLUTION, AND THEN APPLYING TO THE PATTERN ALTERNATELY THE ACID AND THE ALKALINE SOLUTION AND STUCCOING A FINELY GROUND REFACTORY MATERIAL TO THE WET SHELL AFTER EACH APPLICATION, SAID ALKALINE SOLUTION ALWAYS BEING APPLIED WHILE THE SHELL IS STILL WET WITH SAID ACID SOLUTION.
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) | 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 |