US3240634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steels and improved method of manufacture
Assignee: Lasalle Steel Co
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Filing: 1964-07-23
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Granted: 1966-03-15
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Expires: 1984-07-23
Abstract
No abstract record available.
Inventors
- 👤 Elliot S Nachtman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:32
CPC Classifications
C; C21; C21D; C21D8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
THE METALLURIGAL PROCESS FOR TREATING STEEL OF THE TYPE WHICH STRAIN HARDENS AND HARDENS BY SOME MODE OF PRECIPITATION WHEN WORKED AT AN ELEVATED TEMPERATURE WITHIN THE RANGE OF 250* F. TO THE LOWER CRITICAL TEMPERATURE FOR THE STEEL COMPOSITION COMPRISING THE COMBINATION OF STEPS OF AUSTENITIZING THE STEEL, QUENCHING THE STEEL TO A TEMPERATURE BELOW THE LOWER CRITICAL TEMPERATURE FOR THE STEEL COMPOSITION BUT ABOVE ITS MS TEMPERATURE, AND THEN, DIRECTLY FROM THE QUENCHING STEP AND WHILE STILL IN THE FORM OF UNSTABLE AUSTENITE, WORKING THE STEEL TO EFFECT PLASTIC DEFORMATION WHILE THE STEEL IS AT A TEMPERATURE WITHIN THE RANGE OF 250* F. TO THE LOWER CRITICAL TEMPERATURE FOR THE STEEL COMPOSITION, THE CRYSTALLOGRAPHIC ISO-
Claim 2
Dependent Claim
117 words
THE METALLURIGAL PROCESS FOR TREATING STEEL OF THE TYPE WHICH STRAIN HARDENS AND HARDENS BY SOME MODE OF PRECIPITATION WHEN WORKED AT AN ELEVATED TEMPERATURE WITHIN THE RANGE OF 250* F. TO THE LOWER CRITICAL TEMPERATURE FOR THE STEEL COMPOSITION COMPRISING THE COMBINATION OF STEPS OF AUSTENITIZING THE STEEL, QUENCHING THE STEEL TO A TEMPERATURE BELOW THE LOWER CRITICAL TEMPERATURE FOR THE STEEL COMPOSITION BUT ABOVE ITS MS TEMPERATURE, AND THEN, DIRECTLY FROM THE QUENCHING STEP AND WHILE STILL IN THE FORM OF UNSTABLE AUSTENITE, WORKING THE STEEL TO EFFECT PLASTIC DEFORMATION WHILE THE STEEL IS AT A TEMPERATURE WITHIN THE RANGE OF 250* F. TO THE LOWER CRITICAL TEMPERATURE FOR THE STEEL COMPOSITION, THE CRYSTALLOGRAPHIC ISO-
References Cited (Backward Citations)
GB744140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |