Patent US2881108A successfully refreshed from Google Patents.
US2881108A
Expired / Lapsed
US
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Annealed, cold-finished steels
Assignee: Lasalle Steel Co
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Filing: 1956-10-22
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Granted: 1959-04-07
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Expires: 1976-10-22
Abstract
No abstract record available.
Inventors
- 👤 Elliot S Nachtman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:34
CPC Classifications
C; C21; C21D; C21D7/00; C21D7/02; C22; C22C; C22C38/00; C22C38/04; C22C38/02; C21D2211/00; C21D2211/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE METALLURGICAL PROCESS FOR THE IMPROVEMENT OF PHYSICAL AND MECHANICAL PROPERTIES OF STEEL OF THE NONASUSTENITIC TYPE HAVING A PEARLITIC STRUCTURE IN A MATRIX OF FREE FERRITE, COMPRISING THE COMBINATION OF STEPS WHICH INCLUDES ADVANCING THE STEEL THROUGH A DRAW DIE TO EFFECT REDUCTION IN CROSS-SECTIONAL AREA WHILE THE STEEL IS AT A TEMPERATURE WITHIN THE RANGE OF 200* F. TO THE LOWER CRITICAL TEMPERATURE FOR THE STEEL COMPOSITION, AND ANNEALING THE STEEL PRIOR TO ADVANCEMENT OF THE STEEL THROUGH THE DRAW DIE FOR THE ELEVATED-TEMPERATURE-REDUCTION STEP.
Claim 2
Dependent Claim
87 words
THE METALLURGICAL PROCESS FOR THE IMPROVEMENT OF PHYSICAL AND MECHANICAL PROPERTIES OF STEEL OF THE NONASUSTENITIC TYPE HAVING A PEARLITIC STRUCTURE IN A MATRIX OF FREE FERRITE, COMPRISING THE COMBINATION OF STEPS WHICH INCLUDES ADVANCING THE STEEL THROUGH A DRAW DIE TO EFFECT REDUCTION IN CROSS-SECTIONAL AREA WHILE THE STEEL IS AT A TEMPERATURE WITHIN THE RANGE OF 200* F. TO THE LOWER CRITICAL TEMPERATURE FOR THE STEEL COMPOSITION, AND ANNEALING THE STEEL PRIOR TO ADVANCEMENT OF THE STEEL THROUGH THE DRAW DIE FOR THE ELEVATED-TEMPERATURE-REDUCTION STEP.
References Cited (Backward Citations)
US1018369A
Cited
US2462851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |