US2493339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-treatment of cast iron
Assignee: Individual
•
Filing: 1946-07-17
•
Granted: 1950-01-03
•
Expires: 1966-07-17
Abstract
No abstract record available.
Inventors
- 👤 Robert R Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:04
CPC Classifications
C; C21; C21D; C21D5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
THE METHOD OF HEAT TREATING RAW FERROUS METAL CASTINGS CONTAINING PRIMARY CARBIDES OR FREE CEMENTILE WHICH COMPRISES RAPIDLY RAISING THE CASTING HAVING A TEMPERATURE OF APPROXIMATELY 1,000*F. TO A TEMPERATURE BETWEEN 1,900*F. AND 2,100*F., HOLDING IT AT THAT TEMPERATURE BETWEEN TWO AND TWENTY MINUTES, RAPIDLY COOLING THE METAL TO A TEMPERATURE BETWEEN 1,000*F. TO 1,400*F., AND HOLDING IT AT THAT TEMPERATURE BETWEEN TEN AND SIXTY MINUTES.
Claim 2
Independent Claim
66 words
THE METHOD OF HEAT TREATING RAW FERROUS METAL CASTINGS CONTAINING PRIMARY CARBIDES OR FREE CEMENTILE WHICH COMPRISES RAPIDLY RAISING THE CASTING HAVING A TEMPERATURE OF APPROXIMATELY 1,000*F. TO A TEMPERATURE BETWEEN 1,900*F. AND 2,100*F., HOLDING IT AT THAT TEMPERATURE BETWEEN TWO AND TWENTY MINUTES, RAPIDLY COOLING THE METAL TO A TEMPERATURE BETWEEN 1,000*F. TO 1,400*F., AND HOLDING IT AT THAT TEMPERATURE BETWEEN TEN AND SIXTY MINUTES.
References Cited (Backward Citations)
US1325626A
Cited
US1931109A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |