Patent US2624688A successfully refreshed from Google Patents.
US2624688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subzero treatment of chromium alloy steel
Assignee: Babcock and Wilcox Co
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Filing: 1945-10-27
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Granted: 1953-01-06
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Expires: 1965-10-27
Abstract
No abstract record available.
Inventors
- 👤 Ernest J Svenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:36
CPC Classifications
C; C21; C21D; C21D6/00; C21D6/04; Y; Y10; Y10S; Y10S417/00; Y10S417/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
THE METHOD OF TREATING A WORK PIECE OF CHROMIUM ALLOY STEEL INCLUDING SUBSTANTIALLY 1% CARBON AND 1% MANGANESE, WHICH METHOD INCLUDES THE STEPS OF PREHEATING THE WORK PIECE TO APPROXIMATELY 1250* F. TO 1300* F., SUBJECTING THE WORK PIECE TO A HARDENING TEMPERATURE BY RAPIDLY HEATING THE SAME TO APPROXIMATELY 1575* F. TO 1600* F., QUENCHING THE WORK PIECE IN OIL HAVING A TEMPERATURE IN THE RANGE OF 100* F. TO 110* F., COOLING TO ROOM TEMPERATURE, TEMPERING THE WORK PIECE AT APPROXIMATELY 200* F. FOR A PERIOD OF AT LEAST THREE HOURS TO GIVE A ROCKWELL "C" SCALE HARDNESS OF SUBSTANTIALLY 67, ALLOWING THE WORK PIECE TO STAND AFTER TEMPERING FOR AGING THE SAME, SUBJECTING THE WORK PIECE TO A DEEP FREEZING OPERATION IN THE RANGE OF -100* F. TO -150* F. FOR A PERIOD OF AT LEAST THREE HOURS OR MORE, TO FURTHER INCREASE ITS HARDNESS AND RESISTANCE TO WEAR, AND THEN ALLOWING THE WORK PIECE TO WARM UP TO ROOM TEMPERATURE.
Claim 2
Independent Claim
164 words
THE METHOD OF TREATING A WORK PIECE OF CHROMIUM ALLOY STEEL INCLUDING SUBSTANTIALLY 1% CARBON AND 1% MANGANESE, WHICH METHOD INCLUDES THE STEPS OF PREHEATING THE WORK PIECE TO APPROXIMATELY 1250* F. TO 1300* F., SUBJECTING THE WORK PIECE TO A HARDENING TEMPERATURE BY RAPIDLY HEATING THE SAME TO APPROXIMATELY 1575* F. TO 1600* F., QUENCHING THE WORK PIECE IN OIL HAVING A TEMPERATURE IN THE RANGE OF 100* F. TO 110* F., COOLING TO ROOM TEMPERATURE, TEMPERING THE WORK PIECE AT APPROXIMATELY 200* F. FOR A PERIOD OF AT LEAST THREE HOURS TO GIVE A ROCKWELL "C" SCALE HARDNESS OF SUBSTANTIALLY 67, ALLOWING THE WORK PIECE TO STAND AFTER TEMPERING FOR AGING THE SAME, SUBJECTING THE WORK PIECE TO A DEEP FREEZING OPERATION IN THE RANGE OF -100* F. TO -150* F. FOR A PERIOD OF AT LEAST THREE HOURS OR MORE, TO FURTHER INCREASE ITS HARDNESS AND RESISTANCE TO WEAR, AND THEN ALLOWING THE WORK PIECE TO WARM UP TO ROOM TEMPERATURE.
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) | 1956-01-06 | 1956-07-07 | 1957-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-06 | 1960-07-07 | 1961-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-06 | 1964-07-07 | 1965-01-06 | $7700.00 | Window Closed / Lapsed |