Patent US2681874A successfully refreshed from Google Patents.
US2681874A
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Method of preferentially heat treating steel articles
Assignee: Individual
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Filing: 1951-10-23
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Granted: 1954-06-22
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Expires: 1971-10-23
Abstract
No abstract record available.
Inventors
- 👤 Robert J Linney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:44
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
THE METHOD OF HEAT TREATING AND PREFERENTIALLY HARDENING SURFACES AND MAKING DUCTILE THE REMAINDER OF STEEL ARTICLES CONTAINING BETWEEN ABOUT .70% AND ABOUT .90% OF CARBON, BETWEEN ABOUT .40% AND ABOUT .60% OF MANGANESE, LESS THAN ABOUT .03% OF PHOSPHORUS AND OF SULPHUR, THE REMAINDER BEING IRON WITH THE USUAL AMOUNTS OF OTHER IMPURITIES WHICH COMPRISE THE STEPS OF EXPOSING TO THE ATMOSPHERE SUCH AN ARTICLE WHICH IS AT A TEMPERATURE OF ABOUT 1440* F. AND HAS ITS CARBIDES IN SOLUTION, FLOWING WATER AT A TEMPERATURE OF ABOUT 75* F. AGAINST PART OF THE SURFACE OF SAID ARTICLE AND THEREBY QUENCHING SUCH SURFACE, PRECIPITATING THE CARBIDES THEREIN AS FINEGRAINED MARTENSITE AND HARDENING SAID SURFACE, AND THEREUPON COMPLETING THE COOLING IN WATER NEAR ITS BOILING TEMPERATURE.
Claim 2
Independent Claim
125 words
THE METHOD OF HEAT TREATING AND PREFERENTIALLY HARDENING SURFACES AND MAKING DUCTILE THE REMAINDER OF STEEL ARTICLES CONTAINING BETWEEN ABOUT .70% AND ABOUT .90% OF CARBON, BETWEEN ABOUT .40% AND ABOUT .60% OF MANGANESE, LESS THAN ABOUT .03% OF PHOSPHORUS AND OF SULPHUR, THE REMAINDER BEING IRON WITH THE USUAL AMOUNTS OF OTHER IMPURITIES WHICH COMPRISE THE STEPS OF EXPOSING TO THE ATMOSPHERE SUCH AN ARTICLE WHICH IS AT A TEMPERATURE OF ABOUT 1440* F. AND HAS ITS CARBIDES IN SOLUTION, FLOWING WATER AT A TEMPERATURE OF ABOUT 75* F. AGAINST PART OF THE SURFACE OF SAID ARTICLE AND THEREBY QUENCHING SUCH SURFACE, PRECIPITATING THE CARBIDES THEREIN AS FINEGRAINED MARTENSITE AND HARDENING SAID SURFACE, AND THEREUPON COMPLETING THE COOLING IN WATER NEAR ITS BOILING TEMPERATURE.
References Cited (Backward Citations)
GB580728A
Cited
US2441628A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-21 | 1957-12-21 | 1958-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-21 | 1961-12-21 | 1962-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-21 | 1965-12-21 | 1966-06-22 | $7700.00 | Window Closed / Lapsed |