US3345220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Case hardening of steel
Assignee: Huntington Alloys Corp
•
Filing: 1965-10-11
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Granted: 1967-10-03
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Expires: 1985-10-11
Abstract
No abstract record available.
Inventors
- 👤 Haynes Alan George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:39
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/78; C23; C23C; C23C8/00; C23C8/80; Y; Y10; Y10S; Y10S148/00; Y10S148/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A PROCESS FOR CASE-HARDENING A CARBURIZED STEEL ARTICLE SO AS TO PRODUCE A CASE AND CORE CAPABLE OF PERFORMING ELASTICALLY UNDER HIGH STRESS WITHOUT SACRIFICE OF HARDNESS OR WEAR RESISTANCE IN THE CASE, COMPRISING QUENCHING SAID ARTICLE FROM A TEMPERATURE WITHIN THE AUSTENITIZING TEMPERATURE RANGE TO A FIST TEMPERATURE AT WHICH AUSTENITE TRANSFORMATION IN THE CORE IS SUBSTANTIALLY COMPLETE BUT AT WHICH THE CASE REMAINS SUBSTANTIALLY AUSTENITIC, HEATING SAID ARTICLE TO A SECONDTEMPERATURE SUFFICIENTLY TO TEMPER SAID CORE BUT BELOW THE AC1 TEMPERATURE OF THE CORE, HOLDING AT SAID SECOND TEMPERATURE FOR A PERIOD OF TIME SUFFICIENT ONLY TO TEM-
Claim 2
Dependent Claim
100 words
A PROCESS FOR CASE-HARDENING A CARBURIZED STEEL ARTICLE SO AS TO PRODUCE A CASE AND CORE CAPABLE OF PERFORMING ELASTICALLY UNDER HIGH STRESS WITHOUT SACRIFICE OF HARDNESS OR WEAR RESISTANCE IN THE CASE, COMPRISING QUENCHING SAID ARTICLE FROM A TEMPERATURE WITHIN THE AUSTENITIZING TEMPERATURE RANGE TO A FIST TEMPERATURE AT WHICH AUSTENITE TRANSFORMATION IN THE CORE IS SUBSTANTIALLY COMPLETE BUT AT WHICH THE CASE REMAINS SUBSTANTIALLY AUSTENITIC, HEATING SAID ARTICLE TO A SECONDTEMPERATURE SUFFICIENTLY TO TEMPER SAID CORE BUT BELOW THE AC1 TEMPERATURE OF THE CORE, HOLDING AT SAID SECOND TEMPERATURE FOR A PERIOD OF TIME SUFFICIENT ONLY TO TEM-
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) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |