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US2789069A
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Method for improving the machinability of steel
Assignee: Lasalle Steel Co
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Filing: 1954-09-30
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Granted: 1957-04-16
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Expires: 1974-09-30
Abstract
No abstract record available.
Inventors
- 👤 Elliot S Nachtman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:05
CPC Classifications
C; C21; C21D; C21D7/00; C22; C22C; C22C38/00; C22C38/60; Y; Y10; Y10S; Y10S72/00; Y10S72/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
THE METALLURGICAL PROCESS FOR IMPROVING THE MACHINABILITY OF STEEL COMPRISING THE STEPS OF ADVANCING THE STEEL THROUGH A DIE TO EFFECT REDUCTIN IN CROSS-SECTIONAL AREA WHEREIN THE STEEL IS A FREE MACHINING STEEL OF THE NONAUSTENITIC TYPE HAVING COPPER PRESENT AS AN ESSENTIAL ELEMENT IN THE RANGE OF 0.15 TO 0.30 PERCENT BY WEIGHT, 0.04 TO 0.05 PERCENT BY WEIGHT SULPHUR, AND LESS THAN 0.25 PERCENT BY WEIGHT RESIDUAL METALS SELECTED FROM THE GROUP CONSISTING OF NICKEL, CHROMIUM, VANADIUM AND MOLYBDENUM, WITH A MAXIMUM OF 0.05 PERCENT BY WEIGHT OF ANY ONE RESIDUAL METAL, AND SUBSEQUENTLY MACHINING THE STEEL TO PRODUCE PARTS.
Claim 2
Dependent Claim
102 words
THE METALLURGICAL PROCESS FOR IMPROVING THE MACHINABILITY OF STEEL COMPRISING THE STEPS OF ADVANCING THE STEEL THROUGH A DIE TO EFFECT REDUCTIN IN CROSS-SECTIONAL AREA WHEREIN THE STEEL IS A FREE MACHINING STEEL OF THE NONAUSTENITIC TYPE HAVING COPPER PRESENT AS AN ESSENTIAL ELEMENT IN THE RANGE OF 0.15 TO 0.30 PERCENT BY WEIGHT, 0.04 TO 0.05 PERCENT BY WEIGHT SULPHUR, AND LESS THAN 0.25 PERCENT BY WEIGHT RESIDUAL METALS SELECTED FROM THE GROUP CONSISTING OF NICKEL, CHROMIUM, VANADIUM AND MOLYBDENUM, WITH A MAXIMUM OF 0.05 PERCENT BY WEIGHT OF ANY ONE RESIDUAL METAL, AND SUBSEQUENTLY MACHINING THE STEEL TO PRODUCE PARTS.
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) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |