Patent US4435439A successfully refreshed from Google Patents.
Patent US3009843A successfully refreshed from Google Patents.
US3009843A
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US
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Steel products and method for producing same
Assignee: Lasalle Steel Co
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Filing: 1956-10-22
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Granted: 1961-11-21
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Expires: 1976-10-22
Abstract
No abstract record available.
Inventors
- 👤 Elliot S Nachtman
- 👤 John E O'donnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:07
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/02; C21; C21D; C21D8/00; C21D8/06; C23C10/00; C23C10/02; C21D2211/00; C21D2211/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
THE METALLURGICAL PROCESS FOR RTREATING A HOT ROLLED STEEL WHICH STRAIN HARDNESS AND HARDENS BY SOME MODE OF PRECIPITATION WHEN WORKED AT A TEMPERATURE BETWEEN 200* F. AND THE LOWER CRITICAL TEMPERATURE FOR THE HOT ROLLED STEEL COMPOSITION, CONSISTING OF THE FOLLOWING COMBINATION OF STEPS IN THE ORDER SPECIFIED OF ADVANCING THE STEEL THROUGH A DIE TO EFFECT REDUCTION IN CROSS-SECTIONAL AREA WHILE THE STEEL IS AT A TEMPERATURE WITHIN THE RANGE OF 450* F. TO THE LOWER CRITICAL TEMPERATURE FOR THE STEEL COMPOSITION, SUBJECTING THE STEEL TO DIFFUSION TRANSFER SUBSEQUENT TO THE ELEVATED TEMPERATURE REDUCTION STEP FOLLOWED BY COOLING TO ROOM TEMPERATURE.
Claim 2
Dependent Claim
103 words
THE METALLURGICAL PROCESS FOR RTREATING A HOT ROLLED STEEL WHICH STRAIN HARDNESS AND HARDENS BY SOME MODE OF PRECIPITATION WHEN WORKED AT A TEMPERATURE BETWEEN 200* F. AND THE LOWER CRITICAL TEMPERATURE FOR THE HOT ROLLED STEEL COMPOSITION, CONSISTING OF THE FOLLOWING COMBINATION OF STEPS IN THE ORDER SPECIFIED OF ADVANCING THE STEEL THROUGH A DIE TO EFFECT REDUCTION IN CROSS-SECTIONAL AREA WHILE THE STEEL IS AT A TEMPERATURE WITHIN THE RANGE OF 450* F. TO THE LOWER CRITICAL TEMPERATURE FOR THE STEEL COMPOSITION, SUBJECTING THE STEEL TO DIFFUSION TRANSFER SUBSEQUENT TO THE ELEVATED TEMPERATURE REDUCTION STEP FOLLOWED BY COOLING 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) | 1964-11-20 | 1965-05-22 | 1965-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-20 | 1969-05-22 | 1969-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-20 | 1973-05-22 | 1973-11-21 | $7700.00 | Window Closed / Lapsed |