US3231434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of surface hardening steel bodies of revolution
Assignee: Deutsche Edelstahlwerke AG
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Filing: 1963-12-20
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Granted: 1966-01-25
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Expires: 1983-12-20
Abstract
No abstract record available.
Inventors
- 👤 Seulen Gerhard
- 👤 Kuhlbars Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:40
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/06; C21D1/09; C21D1/10; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
184 words
A METHOD OF SURFACE-HARDENING A STEEL WORKPIECE WHICH HAS THE FORM OF A BODY OF REVOLUTION AND WHICH CAN BE HARDENED BY HEATING TO AT LEAST ITS CRITICAL TRANSFORMATION TEMPERATURE AND THEN QUENCHING, COMPRISING THE STEPS OF SUBJECTING THE WORKPIECE TO THE HEATING INFLUENCE OF AN INDUCTION COIL MEANS SURROUNDING THE WORKPIECE WITH ITS AXIS CO-DIRECTIONAL WITH THAT OF SAID WORKPIECE SO AS TO BE EFFECTIVE AROUND THE ENTIRE PERIPHERY OF SAID WORKPIECE, EFFECTING RELATIVE AXIAL RECIPROCATING MOVEMENT BETWEEN THE SAID WORKPIECE AND THE SAID INDUCTION COIL MEANS DURING THE SAID HEATING STEP AT A SPEED AND FOR A SUFFICIENT TIME TO HEAT SUBSTANTIALLY ONLY THE SURFACE PORTION OF SAID WORKPIECE TO BE HARDENED TO AT LEAST SAID TRANSFORMATION TEMPERATURE, THEREAFTER INCREASING THE SPEED OF SAID RELATIVE AXIAL RECIPROCATORY MOVEMENT BETWEEN THE SAID WORKPIECE AND THE SAID INDUCTOR COIL MEANS THEY TO MAINTAIN THE TEMPERATURE OF SAID SURFACE PORTION SUBSTANTIALLY CONSTANT WHILE INCREASING THE DEPTH OF HEATING OF SAID WORKPIECE UNTIL THE SAID DEPTH IS AT LEAST AT SAID TRANSFORMATION TEMPERATURE, AND THEN QUENCHING THE SAID WORKPIECE TO THEREBY FORM THE DESIRED SURFACE-HARDENED LAYER.
Claim 2
Independent Claim
184 words
A METHOD OF SURFACE-HARDENING A STEEL WORKPIECE WHICH HAS THE FORM OF A BODY OF REVOLUTION AND WHICH CAN BE HARDENED BY HEATING TO AT LEAST ITS CRITICAL TRANSFORMATION TEMPERATURE AND THEN QUENCHING, COMPRISING THE STEPS OF SUBJECTING THE WORKPIECE TO THE HEATING INFLUENCE OF AN INDUCTION COIL MEANS SURROUNDING THE WORKPIECE WITH ITS AXIS CO-DIRECTIONAL WITH THAT OF SAID WORKPIECE SO AS TO BE EFFECTIVE AROUND THE ENTIRE PERIPHERY OF SAID WORKPIECE, EFFECTING RELATIVE AXIAL RECIPROCATING MOVEMENT BETWEEN THE SAID WORKPIECE AND THE SAID INDUCTION COIL MEANS DURING THE SAID HEATING STEP AT A SPEED AND FOR A SUFFICIENT TIME TO HEAT SUBSTANTIALLY ONLY THE SURFACE PORTION OF SAID WORKPIECE TO BE HARDENED TO AT LEAST SAID TRANSFORMATION TEMPERATURE, THEREAFTER INCREASING THE SPEED OF SAID RELATIVE AXIAL RECIPROCATORY MOVEMENT BETWEEN THE SAID WORKPIECE AND THE SAID INDUCTOR COIL MEANS THEY TO MAINTAIN THE TEMPERATURE OF SAID SURFACE PORTION SUBSTANTIALLY CONSTANT WHILE INCREASING THE DEPTH OF HEATING OF SAID WORKPIECE UNTIL THE SAID DEPTH IS AT LEAST AT SAID TRANSFORMATION TEMPERATURE, AND THEN QUENCHING THE SAID WORKPIECE TO THEREBY FORM THE DESIRED SURFACE-HARDENED LAYER.
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) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |