US3307232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming shell molds by the use of a fluidized bed drying system
Assignee: Individual
•
Filing: 1965-01-04
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Granted: 1967-03-07
•
Expires: 1985-01-04
Abstract
No abstract record available.
Inventors
- 👤 Fasselle Robert J De
- 👤 Albert J Vidmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:49
CPC Classifications
B; B22; B22C; B22C13/00; B22C13/08; B22C13/085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
APPARATUS FOR FORMING REFRACTORY SHELL MOLDS FOR INVESTMENT CASTING ON DESTRUCTIBLE PATTERNS COMPRISING A DIP TANK CONTAINING A CERAMIC SLURRY COMPRISING REFRACTORY PARTICLES AND A LIQUID VEHICLE, MEANS FOR MAINTAINING THE TEMPERATURE OF THE SLURRY AT A PREDETERMINED VALUE BELOW THE SOFTENING TEMPERATURE OF THE PATTERN, A FLUIDIZED BED HAVING A RECEPTACLE CONTAINING A BODY OF REFRACTORY GRANULES, PRESSURE MEANS FORCING A HEATED CONDITIONED GAS UPWARDLY THROUGH SAID REFRACTORY BODY UNDER A PRESSURE SUFFICIENT TO FLUIDIZE SAID BODY, SUSPENDING MEANS FOR CARRYING THE PATTERN FROM SAID DIP TANK TO SAID FLUIDIZED BED AND FOR CONTINUALLY MOVING THE PATTERN VERTICALLY IN THE BED TO CAUSE THE HEATED REFRACTORY GRANULES TO CONTACT THE ENTIRE OUTER SURFACE OF THE CERAMIC LAYER APPLIED TO THE PATTERN, AND AIR CONDITIONING MEANS FOR MAINTAINING THE DRY-BULB TEMPERATURE OF SAID GAS AT A PREDETERMINED VALUE AT LEAST 5*F. ABOVE THE SLURRY TEMPERATURE AND FOR MAINTAINING THE VEHICLE WET-BULB TEMPERATURE OF SAID GAS AT A PREDETERMINED VALUE AT LEAST 5*F. BELOW THE SLURRY TEMPERATURE.
Claim 2
Dependent Claim
151 words
A PROCESS FOR PRODUCING A REFRACTORY SHELL MOLD ON A DESTRUCTIBLE PATTERN COMPRISING THE STEPS OF APPLYING A CERAMIC SLURRY TO THE OUTER SURFACE OF THE PATTERN TO FORM A WET CERAMIC LAYER, PLACING THE COATED PATTERN IN A FLUIDIZED BED CONTAINING A BODY OF REFRACTORY GRANULES, RAPIDLY REMOVING THE SLURRY VEHICLE FROM THE COATED PATTERN BY FORCING A CONDITIONED GAS UPWARDLY THROUGH SAID REFRACTORY BODY UNDER PRESSURE TO FLUIDIZE SAID BODY WHILE MAINTAINING THE DRY-BULB TEMPERATURE AND THE CONDENSABLE VAPOR CONTENT OF SAID GAS ENTERING SAID BODY AT PREDETERMINED VALUES TO MAINTAIN THE DRY-BULB TEMPERATURE OF SAID GAS ENTERING SAID BODY AT A PREDETERMINED VALUE ABOVE THE TEMPERATURE OF THE PATTERN AND TO MAINTAIN THE VEHICLE WET-BULB TEMPERATURE OF SAID GAS ENTERING SAID BODY AT A PREDETERMINED VALUE BELOW THE TEMPERATURE OF THE PATTERN TO PREVENT DAMAGE TO THE MOLD BY OVERCOOLING, AND REMOVING THE PATTERN FROM THE REFRACTORY BODY.
References Cited (Backward Citations)
US2123537A
Cited
US2932864A
Cited
US2954643A
Cited
US3212197A
Cited
US3165799A
Cited
US3171174A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |