US2974035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nodular graphite steel
Assignee: RES INST IRON STEEL
•
Filing: 1958-06-10
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Granted: 1961-03-07
•
Expires: 1978-06-10
Abstract
No abstract record available.
Inventors
- 👤 Ototani Tohei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:30
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/04; C22C33/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A NODULAR GRAPHITE STEEL CONTAINING CALCIUM AND CERIUM IN THE AMOUNT OF 0.001 TO 0.5% OF CALCIUM AND 0.005 TO 0.15% OF CERIUM AND THE BALANCE A STEEL COMPOSITION WITH LESS THAN ABOUT 1.7% OC CARBON, SAID CASTING BEING CHARACTERIZED IN THE AS-CAST CONDITION BY A MICROSTRUCTURE COMPRISED OF SOFT, GRAY-COLORED, SUBSTANTIALLY SPHERICAL GRAPHITE PARTICLES DISPERSED IN FERRITE AND PEARLITE.
Claim 2
Dependent Claim
48 words
A NODULAR GRAPHITE STEEL HAVING THE CHARACTERISTIC, IN THE AS-CAST CONDITION, OF A MICROSTRUCTURE CONTAINING SUBSTANTIALLY SPHERICAL PARTICLES OF UNCOMBINED CARBON DISPERSED IN FERRITE AND PEARLITE AND BEING COMPRISED OF ABOUT 0.001 TO 0.5% OF CALCIUM WITH THE BALANCE STEEL COMPOSITION WITH LESS THAN ABOUT 1.7% OF CARBON.
References Cited (Backward Citations)
US2280283A
Cited
US2610912A
Cited
US2488511A
Cited
US2948605A
Cited
US2765225A
Cited
GB774138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |