US3222229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of hardening alloy steels
Assignee: Voestalpine AG
•
Filing: 1963-07-30
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Granted: 1965-12-07
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Expires: 1983-07-30
Abstract
No abstract record available.
Inventors
- 👤 Pribyl Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:28
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/24; C21; C21D; C21D1/00; C21D1/06; C21D1/09; C21D1/10; C22C38/22; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A PROCESS FOR HARDENING ALLOY STEELS COMPRISING THE STEPS OF PREPARING A WORKPIECE HAVING A CROSS-SECTIONAL AREA EXTENDING 100 SQUARE CENTIMETERS AND CONSISTING ESSENTIALLY OF 0.4-0.55% C, 0.25-0.35% SI, 0.5-0.8% MN, 2.8-3.3% CR AND THE BALANCE IRON, SURFACE HEATING SAID WORKPIECE TO A SURFACE TEMPERATURE AT LEAST AS GREAT AS THE HARDENING TEMPERATURE FOR THE ALLOY STEEL, QUENCHING SAID WORKPIECE IN WATER, AND TEMPERING SAID WORKPIECE.
Claim 2
Dependent Claim
66 words
A PROCESS FOR HARDENING ALLOY STEELS COMPRISING THE STEPS OF PREPARING A WORKPIECE HAVING A CROSS-SECTIONAL AREA EXTENDING 100 SQUARE CENTIMETERS AND CONSISTING ESSENTIALLY OF 0.4-0.55% C, 0.25-0.35% SI, 0.5-0.8% MN, 2.8-3.3% CR AND THE BALANCE IRON, SURFACE HEATING SAID WORKPIECE TO A SURFACE TEMPERATURE AT LEAST AS GREAT AS THE HARDENING TEMPERATURE FOR THE ALLOY STEEL, QUENCHING SAID WORKPIECE IN WATER, AND TEMPERING SAID WORKPIECE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |