US2821760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame heating of metal castings to reduce shrinkage cavities
Assignee: Union Carbide Corp
•
Filing: 1956-12-24
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Granted: 1958-02-04
•
Expires: 1976-12-24
Abstract
No abstract record available.
Inventors
- 👤 Edward F Kurzinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:04
CPC Classifications
B; B22; B22D; B22D27/00; B22D27/04; B22D27/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN THE PROCESS OF TREATING A FRESHLY POURED MOLTEN METAL CASTING TO KEEP THE TOP OF THE CASTING MOLTEN WHILE SAID CASTING SOLIDFIES FROM THE BOTTOM TO THE TOP THEREOF TO REDUCE THE SIZE OF THE SHRINKAGE CAVITY THEREIN, WHEREIN AN OXY-FUEL FLAME IS DIRECTED AGAINST THE TOP SURFACE OF SAID CASTING DURING SUCH COOLING, THE IMPROVEMENT WHICH COMPRISES IN COMBINATION THEREWITH POSITIONING A BURNER NOZZLE ABOVE THE TOP SURFACE OF SAID CASTING AND VERTICALLY SPACED THEREFROM A DISTANCE SUCH THAT OVERHEATING OF THE NOZZLE IS AVOIDED, AND APPLYING FROM SAID BURNER NOZZLE AGAINST SAID TOP SURFACE AN OXY-FUEL GAS MIXTURE HAVING AN OXYGEN TO FUEL GAS RATIO OF FROM 1.3:1 TO 1.8:1 AND A VELOCITY OF FROM 200 FEET PER SECOND TO 1000 FEET PER SECOND, TO BURN SAID MIXTURE WITH A STABLE BLOW-OFF FLAME BY CONTINUOUS IGNITION THEREOF BY THE MOLTEN CASTING.
Claim 2
Dependent Claim
144 words
IN THE PROCESS OF TREATING A FRESHLY POURED MOLTEN METAL CASTING TO KEEP THE TOP OF THE CASTING MOLTEN WHILE SAID CASTING SOLIDFIES FROM THE BOTTOM TO THE TOP THEREOF TO REDUCE THE SIZE OF THE SHRINKAGE CAVITY THEREIN, WHEREIN AN OXY-FUEL FLAME IS DIRECTED AGAINST THE TOP SURFACE OF SAID CASTING DURING SUCH COOLING, THE IMPROVEMENT WHICH COMPRISES IN COMBINATION THEREWITH POSITIONING A BURNER NOZZLE ABOVE THE TOP SURFACE OF SAID CASTING AND VERTICALLY SPACED THEREFROM A DISTANCE SUCH THAT OVERHEATING OF THE NOZZLE IS AVOIDED, AND APPLYING FROM SAID BURNER NOZZLE AGAINST SAID TOP SURFACE AN OXY-FUEL GAS MIXTURE HAVING AN OXYGEN TO FUEL GAS RATIO OF FROM 1.3:1 TO 1.8:1 AND A VELOCITY OF FROM 200 FEET PER SECOND TO 1000 FEET PER SECOND, TO BURN SAID MIXTURE WITH A STABLE BLOW-OFF FLAME BY CONTINUOUS IGNITION THEREOF BY THE MOLTEN CASTING.
References Cited (Backward Citations)
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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) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |