Patent FR1329624A successfully refreshed from Google Patents.
US3702269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultra high strength ductile iron
Assignee: Huntington Alloys Corp
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Filing: 1971-01-22
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Granted: 1972-11-07
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Expires: 1991-01-22
Abstract
Abstract DIRECTED TO ALLOYED DUCTILE IRONS HAVING IN THE ASTEMPERED CONDITION A YIELD STRENGTH (0.2% OFFSET) OF AT LEAST ABOUT 150,000 P.S.I., AND EVEN AT LEAST ABOUT 170,000 P.S.I., WHICH CONTAIN ABOUT 2.6% TO ABOUT 4.0% CARBON, ABOUT 1.5% TO 4% SILICON, ABOUT 6% TO 11% NICKEL, UP TO ABOUT 7% COBALT, AND EFFECTIVE AMOUNT OF A GRAPHITE SPHERIODIZING AGENT, UP TO ABOUT 1% MANGENESE, UP TO ABOUT 0.4% MOLYBDENUM AND THE BALANCE ESSENTIALLY IRON.
Inventors
- 👤 Nathan Lewis Church
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:34
CPC Classifications
C; C22; C22C; C22C37/00; C22C37/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |