US3320101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot rolled steel rod
Assignee: Siemens Industry Inc
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Filing: 1963-05-24
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Granted: 1967-05-16
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Expires: 1983-05-24
Abstract
No abstract record available.
Inventors
- 👤 David W Mclean
- 👤 Charles G Easter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:13
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/84; C21D9/00; C21D9/52; C21D9/525; C21D9/54; C21D9/56; C21D9/573; C21D9/5732
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A STEEL PRODUCT COMPRISING A SUBSTANTIAL LENGTH OF MEDIUM TO HIGH CARBON STEEL ROD, THE MICROSTRUCTURE OF SAID STEEL THROUGHOUT THE LENGTH OF SAID ROD BEING SUBSTANTIALLY UNIFORMLY DISPERSED PREDOMINANTLY FINE PEARLITE GRAINS WITH A MINIMUM OF GRAIN BOUNDARY FERRITE AND SUBSTANTIALLY FREE OF BAINITE, SAID GRAINS BEING THE TRANSFORMATION PRODUCT OF AUSTENITE GRAINS WHICH HAVE BEEN HOT WORKED AND SEQUENTIALLY COOLED PRIOR TO TRANSFORMATION RAPIDLY ENOUGH TO GIVE A RESULTING GRAIN SIZE WHICH IS SUBSTANTIALLY SMALLER THAN THAT WHICH RESULTS FROM REHEATING THE SAME ROD, AFTER IT HAS ONCE COOLED THROUGH TRANSFORMATION, TO ABOUT 1800*F. AND THEREAFTER COOLING THE SAME IN STILL AIR; THE SCALE ON THE SURFACE OF SAID ROD BEING UNIFORM AND RELATIVELY FREE FROM IRON AND MAGNETITE IN THE WUSTITE AREA, SAID SCALE AMOUNTING TO LESS THAN 1 WEIGHT PERCENT OF SAID ROD.
Claim 2
Dependent Claim
137 words
A STEEL PRODUCT COMPRISING A SUBSTANTIAL LENGTH OF MEDIUM TO HIGH CARBON STEEL ROD, THE MICROSTRUCTURE OF SAID STEEL THROUGHOUT THE LENGTH OF SAID ROD BEING SUBSTANTIALLY UNIFORMLY DISPERSED PREDOMINANTLY FINE PEARLITE GRAINS WITH A MINIMUM OF GRAIN BOUNDARY FERRITE AND SUBSTANTIALLY FREE OF BAINITE, SAID GRAINS BEING THE TRANSFORMATION PRODUCT OF AUSTENITE GRAINS WHICH HAVE BEEN HOT WORKED AND SEQUENTIALLY COOLED PRIOR TO TRANSFORMATION RAPIDLY ENOUGH TO GIVE A RESULTING GRAIN SIZE WHICH IS SUBSTANTIALLY SMALLER THAN THAT WHICH RESULTS FROM REHEATING THE SAME ROD, AFTER IT HAS ONCE COOLED THROUGH TRANSFORMATION, TO ABOUT 1800*F. AND THEREAFTER COOLING THE SAME IN STILL AIR; THE SCALE ON THE SURFACE OF SAID ROD BEING UNIFORM AND RELATIVELY FREE FROM IRON AND MAGNETITE IN THE WUSTITE AREA, SAID SCALE AMOUNTING TO LESS THAN 1 WEIGHT PERCENT OF SAID ROD.
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) | 1970-05-15 | 1970-11-14 | 1971-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-15 | 1974-11-14 | 1975-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-15 | 1978-11-14 | 1979-05-16 | $7700.00 | Window Closed / Lapsed |