US2852422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of heat treating metal objects
Assignee: Selas Corp of America
•
Filing: 1953-07-08
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Granted: 1958-09-16
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Expires: 1973-07-08
Abstract
No abstract record available.
Inventors
- 👤 Frederic O Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:44
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/0062; C21D1/00; C21D8/00; C21D2221/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE METHOD OF PROCESSING A STEEL OBJECT THAT MAY BE HARDENED WHICH COMPRISES HEATING THE OBJECT FROM AMBIENT TEMPERATURE TO A TEMPERATURE IN THE RANGE OF FROM 1750*F. TO 1900*F. AT A RATE OF FROM 2 TO 5 MINUTES PER INCH, MOVING THE OBJECT DIRECTLY FROM THE PLACE OF HEATING TO A HOT WORKING APPARATUS AND PERFORMING WORK UPON IT, IMMEDIATELY QUENCHING THE OBJECT AFTER IT HAS BEEN HOT WORKED FROM THE TEMPERATURE AT WHICH IT IS REMOVED FROM THE HOT WORKING APPARATUS TO A VALUE NOT MORE THAN 300*F., TRANSFERRING THE OBJECT TO A TEMPERING ZONE IN WHICH ITS TEMPERATURE IS RAISED TO A VALUE WITHIN THE RANGE OF FROM 700*F. TO 1300*F., AND THEREAFTER AIR COOLING THE OBJECT.
Claim 2
Independent Claim
120 words
THE METHOD OF PROCESSING A STEEL OBJECT THAT MAY BE HARDENED WHICH COMPRISES HEATING THE OBJECT FROM AMBIENT TEMPERATURE TO A TEMPERATURE IN THE RANGE OF FROM 1750*F. TO 1900*F. AT A RATE OF FROM 2 TO 5 MINUTES PER INCH, MOVING THE OBJECT DIRECTLY FROM THE PLACE OF HEATING TO A HOT WORKING APPARATUS AND PERFORMING WORK UPON IT, IMMEDIATELY QUENCHING THE OBJECT AFTER IT HAS BEEN HOT WORKED FROM THE TEMPERATURE AT WHICH IT IS REMOVED FROM THE HOT WORKING APPARATUS TO A VALUE NOT MORE THAN 300*F., TRANSFERRING THE OBJECT TO A TEMPERING ZONE IN WHICH ITS TEMPERATURE IS RAISED TO A VALUE WITHIN THE RANGE OF FROM 700*F. TO 1300*F., AND THEREAFTER AIR COOLING THE OBJECT.
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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) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |