US2935433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for surface hardening steel articles
Assignee: Voestalpine AG
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Filing: 1956-11-19
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Granted: 1960-05-03
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Expires: 1976-11-19
Abstract
No abstract record available.
Inventors
- 👤 Pribyl Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:44
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/06; C21D1/08; C21D1/62; C21D1/667
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
PROCESS FOR SURFACE HARDENING STEEL ARTICLES, PARTICULARLY COLD ROLLS HAVING A DIAMETER EXCEEDING ABOUT 300 MM. EITHER BY THE FEED METHOD OR THE ROTATING AND FEED METHOD AND COMPRISING THE STEP OF PREHEATING THE WORK PIECE SURFACE BY STARTING TO HEAT THE WORK PIECE SURFACE TO A TEMPERATURE IN THE RANGE OF 950-1050*C. AND BY KEEPING THE WORK PIECE SURFACE IN A ZONE OF INCANDESCENCE HAVING A MINIMUM WIDTH OF 250 MM. AND A TEMPERATURE LYING ABOVE THE AC3 POINT, THE SECOND STEP OF HEATING THE WORK PIECE SURFACE AT THE FINISHING END OF THE ZONE TO HARDENING TEMPERATURE WITHIN THE RANGE OF 800-880*C. AND THE THIRD STEP OF QUENCHING THE WORK PIECE SURFACE BY MEANS OF A SPRAYER.
Claim 2
Dependent Claim
119 words
PROCESS FOR SURFACE HARDENING STEEL ARTICLES, PARTICULARLY COLD ROLLS HAVING A DIAMETER EXCEEDING ABOUT 300 MM. EITHER BY THE FEED METHOD OR THE ROTATING AND FEED METHOD AND COMPRISING THE STEP OF PREHEATING THE WORK PIECE SURFACE BY STARTING TO HEAT THE WORK PIECE SURFACE TO A TEMPERATURE IN THE RANGE OF 950-1050*C. AND BY KEEPING THE WORK PIECE SURFACE IN A ZONE OF INCANDESCENCE HAVING A MINIMUM WIDTH OF 250 MM. AND A TEMPERATURE LYING ABOVE THE AC3 POINT, THE SECOND STEP OF HEATING THE WORK PIECE SURFACE AT THE FINISHING END OF THE ZONE TO HARDENING TEMPERATURE WITHIN THE RANGE OF 800-880*C. AND THE THIRD STEP OF QUENCHING THE WORK PIECE SURFACE BY MEANS OF A SPRAYER.
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) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |