Patent US2867556A successfully refreshed from Google Patents.
US2867556A
Expired / Lapsed
US
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Method of flame hardening
Assignee: Giddings and Lewis LLC
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Filing: 1953-09-18
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Granted: 1959-01-06
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Expires: 1973-09-18
Abstract
No abstract record available.
Inventors
- 👤 George E Tegen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:37
CPC Classifications
C; C21; C21D; C21D5/00; C21D1/00; C21D1/06; C21D1/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
142 words
THE METHOD OF FLAME HARDENING A RAIL-LIKE WORKPIECE OF CAST IRON HAVING A CROSS SECTION OF INVERTED VSHAPE, SAID METHOD COMPRISING THE STEPS OF, FLAME HARDENING A LONGITUDINAL SURFACE OF SAID WORKPIECE WHILE RESTRAINING ONLY THE ENDS OF THE SAME, REMOVING THE RESTRAINT ON SAID ENDS AFTER SAID SURFACE OF SAID WORKPIECE HAS BEEN FLAME HARDENED WHEREBY SAID WORKPIECE ASSUMES A LONGITUDINAL CURVATURE HAVING A MAXIMUM NORMAL DEFLECTION AT THE CENTER OF THE WORKPIECE, INVERTING SAID WORKPIECE AND PLACING THE SAME ON A SUPPORT, HEATING SAID WORKPIECE TO A TEMPERATURE OF APPROXIMATELY 300 DEGREES FAHRENHEIT, MECHANICALLY LOADING THE WORKPIECE AT ITS CENTER UNTIL IT ASSUMES A REVERSE DEFLECTION WITHIN THE RANGE OF ABOUT 3 TO 4.5 TIMES SAID NORMAL DEFLECTION, AND RELEASING THE LOADING ON SAID WORKPIECE WHEN THE SAME HAS COOLED TO ROOM TEMPERATURE WHEREBY SAID WORKPIECE ASSUMES A STRAIGHT CONDITION.
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) | 1962-01-05 | 1962-07-07 | 1963-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-05 | 1966-07-07 | 1967-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-05 | 1970-07-07 | 1971-01-06 | $7700.00 | Window Closed / Lapsed |