US3367393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally insulated shell mold and method for making same
Assignee: Howmet Turbine Components Corp
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Filing: 1964-09-04
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Granted: 1968-02-06
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Expires: 1984-09-04
Abstract
No abstract record available.
Inventors
- 👤 William M Lenahan
- 👤 Arthur G Watts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:39
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/165; B22C23/00; B22C23/02; B22C9/00; B22C9/02; B22C9/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
58 words
IN A THERMALLY INSULATED REFRACTORY SHELL MOLD COMPRISING A PLURALITY OF LAYERS OF BONDED REFRACTORY MATERIAL, THE IMPROVEMENT WHICH COMPRISES (A) ONE OR MORE ALTERNATE LAYERS EXCLUDING THE INNER LAYER DEFINING AT LEAST PART F A MULTIPLICITY OF VOIDS WHICH REDUCE THE COOLING RATE OF THE MOLD, (B) AT LEAST THE INNER LAYER BEING FREE OF SUCH VOIDS.
Claim 2
Dependent Claim
58 words
IN A THERMALLY INSULATED REFRACTORY SHELL MOLD COMPRISING A PLURALITY OF LAYERS OF BONDED REFRACTORY MATERIAL, THE IMPROVEMENT WHICH COMPRISES (A) ONE OR MORE ALTERNATE LAYERS EXCLUDING THE INNER LAYER DEFINING AT LEAST PART F A MULTIPLICITY OF VOIDS WHICH REDUCE THE COOLING RATE OF THE MOLD, (B) AT LEAST THE INNER LAYER BEING FREE OF SUCH VOIDS.
Claim 3
Dependent Claim
98 words
IN THE MANUFACTURE OF A REFRACTORY MOLD WHEREIN A MULTI-LAYERED SHELL IS FORMED BY SUCCESSIVELY COATING AND HARDENING SLURRIES COMPRISING A BINDER AND A FINE REFRACTORY ON A PATTERN AND THEREAFTER ELIMINATING THE PATTERN, A METHOD OF PROVIDING A MULTIPLICITY OF VOIDS THROUGH THE SHELL WHICH COMPRISES: (A) DISTRIBUTING A PARTICULATE THERMALLY DECOMPOSABLE MATERIAL OVER THE SURFACE OF AT LEAST ONE OF THE SLURRY COATS SUBSEQUENT TO THE FIRST BEFORE IT IS HARDENED, AND (B) SUBSEQUENTLY HEATING THE SHELL ABOVE THE DECOMPOSITION TEMPERATURE OF THE MATERIAL TO ELIMINATE THE MATERIAL AND LEAVE VOIDS DISTRIBUTED THROUGHOUT THE SHELL WALL.
Claim 4
Dependent Claim
98 words
IN THE MANUFACTURE OF A REFRACTORY MOLD WHEREIN A MULTI-LAYERED SHELL IS FORMED BY SUCCESSIVELY COATING AND HARDENING SLURRIES COMPRISING A BINDER AND A FINE REFRACTORY ON A PATTERN AND THEREAFTER ELIMINATING THE PATTERN, A METHOD OF PROVIDING A MULTIPLICITY OF VOIDS THROUGH THE SHELL WHICH COMPRISES: (A) DISTRIBUTING A PARTICULATE THERMALLY DECOMPOSABLE MATERIAL OVER THE SURFACE OF AT LEAST ONE OF THE SLURRY COATS SUBSEQUENT TO THE FIRST BEFORE IT IS HARDENED, AND (B) SUBSEQUENTLY HEATING THE SHELL ABOVE THE DECOMPOSITION TEMPERATURE OF THE MATERIAL TO ELIMINATE THE MATERIAL AND LEAVE VOIDS DISTRIBUTED THROUGHOUT THE SHELL WALL.
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) | 1971-02-05 | 1971-08-07 | 1972-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-05 | 1975-08-07 | 1976-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-05 | 1979-08-07 | 1980-02-06 | $7700.00 | Window Closed / Lapsed |