Patent US3137596A successfully refreshed from Google Patents.
US3137596A
Expired / Lapsed
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Method for hardening a nitrided steel
Assignee: Individual
•
Filing: 1962-10-03
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Granted: 1964-06-16
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Expires: 1982-10-03
Abstract
No abstract record available.
Inventors
- 👤 Paul M Unterweiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:47
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
THE METHOD OF TREATING A STEEL WHICH HAS BEEN NITRIDED WHICH COMPRISES THE STEPS OF RAPIDLY HEATING SUBSTANTIALLY ONLY THE NITRIDED PORTION OF THE STEEL TO A TEMPERATURE WITHIN THE AUSTENITIZING RANGE FOR THE STEEL, HOLDING THE STEEL AT THE AUSTENITIZING TEMPERATURE FOR A RELATIVELY SHORT TIME RANGING FROM ABOUT TEN SECONDS DOWN TO AND APPROACHING ZERO, AND THEN INITIATING AND CONTINUING QUENCHING UNTIL A TEMPERATURE IS REACHED SUCH
Claim 2
Independent Claim
69 words
THE METHOD OF TREATING A STEEL WHICH HAS BEEN NITRIDED WHICH COMPRISES THE STEPS OF RAPIDLY HEATING SUBSTANTIALLY ONLY THE NITRIDED PORTION OF THE STEEL TO A TEMPERATURE WITHIN THE AUSTENITIZING RANGE FOR THE STEEL, HOLDING THE STEEL AT THE AUSTENITIZING TEMPERATURE FOR A RELATIVELY SHORT TIME RANGING FROM ABOUT TEN SECONDS DOWN TO AND APPROACHING ZERO, AND THEN INITIATING AND CONTINUING QUENCHING UNTIL A TEMPERATURE IS REACHED SUCH
References Cited (Backward Citations)
US2845377A
Cited
US2958619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |