US3233994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming refractory casting
Assignee: Individual
•
Filing: 1961-09-21
•
Granted: 1966-02-08
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Expires: 1981-09-21
Abstract
No abstract record available.
Inventors
- 👤 Penberthy Harvey Larry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:10
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/32; C04B33/323
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
A METHOD OF FORMING REFRACTORY CASTINGS WHOSE OUTER SHELL COOLS SUFFICIENTLY FASTER THAN ITS INNER PORTION AND WHICH SHRINKS SUFFICIENTLY IN SOLIDIFYING TO RESULT IN THE FORMATION OF INTERNAL VOIDS, COMPRISING: FILLING THE LOWER PORTION OF THE MOLD IN WHICH THE CASTING IS BEING FORMED WITH AN INITIAL QUANTITY OF MOLTEN REFRACTORY MATERIAL UNTIL SAID MOLD IS APPROXIMATELY ONE THIRD FULL TO FORM THE RELATIVELY DENSE AND NON-POROUS BOTTOM PORTION OF THE CASTING WHICH RESULTS FROM RAPID CHILLING OF THIS PORTION; MIXING WITH THE SUBSEQUENTLY ADDED MOLTEN MATERIAL DURING THE MOLD-FILLING OPERATION A QUANTITY OF SOLID PARTICLES OF SAID REFRACTORY MATERIAL SUCH THAT SAID PARTICLES WITHDRAW FROM AT LEAST THE CENTRAL PORTION OF SAID MOLTEN MATERIAL THE EXCESS SENSIBLE HEAT ABOVE ITS FUSION POINT AND AT LEAST A PORTION OF ITS EXCESS LATENT HEAT OF FUSION; SAID SOLID PARTICLES BEING HEATED SUFFICIENTLY BY SAID MOLTEN MATERIAL TO CAUSE THEM TO REACH A TEMPERATURE BETWEEN THAT AT WHICH THEY ARE FULLY SOLID AND THAT AT WHICH THEY ARE FULLY LIQUID SO THAT THEY LOSE THEIR DISCRETE SHAPE AND MIX INTIMATELY WITH SAID MOLTEN LIQUID.
Claim 2
Independent Claim
183 words
A METHOD OF FORMING REFRACTORY CASTINGS WHOSE OUTER SHELL COOLS SUFFICIENTLY FASTER THAN ITS INNER PORTION AND WHICH SHRINKS SUFFICIENTLY IN SOLIDIFYING TO RESULT IN THE FORMATION OF INTERNAL VOIDS, COMPRISING: FILLING THE LOWER PORTION OF THE MOLD IN WHICH THE CASTING IS BEING FORMED WITH AN INITIAL QUANTITY OF MOLTEN REFRACTORY MATERIAL UNTIL SAID MOLD IS APPROXIMATELY ONE THIRD FULL TO FORM THE RELATIVELY DENSE AND NON-POROUS BOTTOM PORTION OF THE CASTING WHICH RESULTS FROM RAPID CHILLING OF THIS PORTION; MIXING WITH THE SUBSEQUENTLY ADDED MOLTEN MATERIAL DURING THE MOLD-FILLING OPERATION A QUANTITY OF SOLID PARTICLES OF SAID REFRACTORY MATERIAL SUCH THAT SAID PARTICLES WITHDRAW FROM AT LEAST THE CENTRAL PORTION OF SAID MOLTEN MATERIAL THE EXCESS SENSIBLE HEAT ABOVE ITS FUSION POINT AND AT LEAST A PORTION OF ITS EXCESS LATENT HEAT OF FUSION; SAID SOLID PARTICLES BEING HEATED SUFFICIENTLY BY SAID MOLTEN MATERIAL TO CAUSE THEM TO REACH A TEMPERATURE BETWEEN THAT AT WHICH THEY ARE FULLY SOLID AND THAT AT WHICH THEY ARE FULLY LIQUID SO THAT THEY LOSE THEIR DISCRETE SHAPE AND MIX INTIMATELY WITH SAID MOLTEN LIQUID.
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) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |