US2579452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Malleable iron with boron and bismuth
Assignee: Crane Co
•
Filing: 1949-10-04
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Granted: 1951-12-25
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Expires: 1969-10-04
Abstract
No abstract record available.
Inventors
- 👤 Harry A Eckman
- 👤 Henry W Maack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:51
CPC Classifications
C; C22; C22C; C22C37/00; C22C37/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
A WHITE IRON CASTING OF RELATIVELY THICK SECTION SUBSTANTIALLY FREE FROM PRIMARY GRAPHITE AND READILY ANNEALABLE TO PRODUCE MALLEABLE IRON CONTAINING APPROXIMATELY 2.25 TO 3.25% CARBON, .60 TO 1.20% SILICON, .30 TO .70% MANGANESE, AND SMALL BUT EFFECTIVE AMOUNTS OF BISMUTH RANGING UP TO .025% AND UP TO .010% OF BORON TO PREVENT THE FORMATION OF PRIMARY GRAPHITE DURING SOLIDIFICATION, THE BORON FACILITATING THE DECOMPOSITION OF CARBIDES DURING ANNEALING, THEREBY OFFSETTING THE RETARDING EFFECT OF BISMUTH IN THE GRAPHITIZATION OF THE IRON.
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) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |