US2857299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of heat treating steel
Assignee: Bethlehem Steel Corp
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Filing: 1954-07-14
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Granted: 1958-10-21
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Expires: 1974-07-14
Abstract
No abstract record available.
Inventors
- 👤 Epstcin Samuel
- 👤 Jr Joseph D Dennison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:33
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A METHOD OF LOWERING THE TRANSITION TEMPERATURE IN THE NOTCHED BAR IMPACT TEST OF SEMI-KILLED OPEN-HEARTH STEEL PLATE CONTAINING .05% TO .20% CARBON, .25% TO .60% MANGANESE, AND THE BALANCE CONSISTING ESSENTIALLY OF IRON, COMPRISING HOT ROLLING SIAD PLATE AND WATER QUENCHING THE SAID STEEL PLATE IMMEDIATELY FROM THE HOT ROLLING OPERATION, THE TEMPERATURE AT WHICH SAID PLATE IS QUENCHED BEING ABOVE THE UPPER CRITICAL TEMPERATURE OF THE SAID STEEL PLATE.
Claim 2
Independent Claim
71 words
A METHOD OF LOWERING THE TRANSITION TEMPERATURE IN THE NOTCHED BAR IMPACT TEST OF SEMI-KILLED OPEN-HEARTH STEEL PLATE CONTAINING .05% TO .20% CARBON, .25% TO .60% MANGANESE, AND THE BALANCE CONSISTING ESSENTIALLY OF IRON, COMPRISING HOT ROLLING SIAD PLATE AND WATER QUENCHING THE SAID STEEL PLATE IMMEDIATELY FROM THE HOT ROLLING OPERATION, THE TEMPERATURE AT WHICH SAID PLATE IS QUENCHED BEING ABOVE THE UPPER CRITICAL TEMPERATURE OF THE SAID STEEL PLATE.
References Cited (Backward Citations)
US827882A
Cited
US1205998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |