US2762701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburizing molten ferrous metal
Assignee: Airco Inc
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Filing: 1954-03-03
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Granted: 1956-09-11
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Expires: 1974-03-03
Abstract
No abstract record available.
Inventors
- 👤 Francis T Crego
- 👤 Philip M Hulme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:19
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/0025; C21C1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
THE METHOD OF CARBURIZING CAST IRON WHICH COMPRISES INTRODUCING A CARBONACEOUS MATERIAL COMPOSED MAINLY OF ELEMENTAL CARBON INTO A BODY OF MOLTEN CAST IRON AT A SUBSTANTIAL DISTANCE BENEATH THE SURFACE THEREOF, CHARACTERIZED IN THAT SAID CARBONACEOUS MATERIAL IS IN FINELY DIVIDED GRANULAR FORM AND IS DELIVERED INTO SAID MOLTEN METAL BY MEANS OF A CARRIER GAS, THE VOLUME OF CARRIER GAS EMPLOYED BEING (AT STANDARD TEMPERATURE AND PRESSURE) FROM ABOUT ONE-QUARTER TO ABOUT TWO CUBIC FEET PER POUND OF SOLID MATERIAL DELIVERED INTO THE MOLTEN METAL, AND FURTHER CHARACTERIZED IN THAT SAID CARBONACEOUS MATERIAL IS SUBSTANTIALLY FREE OF MOISTURE AND VOLATILE MATTER, WHEREBY NO SUBSTANTIAL INCREASE IN THE VOLUME OF GAS RELATIVE TO THE WEIGHT OF SOLID MATERIAL DELIVERED INTO THE MOLTEN METAL RESULTS FROM HEATING SAID CARBONACEOUS MATERIAL TO THE TEMPERATURE OF THE MOLTEN METAL.
Claim 2
Independent Claim
137 words
THE METHOD OF CARBURIZING CAST IRON WHICH COMPRISES INTRODUCING A CARBONACEOUS MATERIAL COMPOSED MAINLY OF ELEMENTAL CARBON INTO A BODY OF MOLTEN CAST IRON AT A SUBSTANTIAL DISTANCE BENEATH THE SURFACE THEREOF, CHARACTERIZED IN THAT SAID CARBONACEOUS MATERIAL IS IN FINELY DIVIDED GRANULAR FORM AND IS DELIVERED INTO SAID MOLTEN METAL BY MEANS OF A CARRIER GAS, THE VOLUME OF CARRIER GAS EMPLOYED BEING (AT STANDARD TEMPERATURE AND PRESSURE) FROM ABOUT ONE-QUARTER TO ABOUT TWO CUBIC FEET PER POUND OF SOLID MATERIAL DELIVERED INTO THE MOLTEN METAL, AND FURTHER CHARACTERIZED IN THAT SAID CARBONACEOUS MATERIAL IS SUBSTANTIALLY FREE OF MOISTURE AND VOLATILE MATTER, WHEREBY NO SUBSTANTIAL INCREASE IN THE VOLUME OF GAS RELATIVE TO THE WEIGHT OF SOLID MATERIAL DELIVERED INTO THE MOLTEN METAL RESULTS FROM HEATING SAID CARBONACEOUS MATERIAL TO THE TEMPERATURE OF THE MOLTEN METAL.
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) | 1959-09-11 | 1960-03-12 | 1960-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-11 | 1964-03-12 | 1964-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-11 | 1968-03-12 | 1968-09-11 | $7700.00 | Window Closed / Lapsed |