US3729308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron nickel chromium alloys
Assignee: Huntington Alloys Corp
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Filing: 1970-07-21
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Granted: 1973-04-24
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Expires: 1990-07-21
Abstract
Abstract IRON-BASE ALLOYS FOR SHEATHING ELECTRIC HEATER ELEMENTS INCLUDE SPECIALLY PROPORTIONED AMOUNTS OF NICKEL (ABOUT 15% TO ABOUT 23%), CHROMIUM (ABOUT 17% TO ABOUT 23%), SILICON (ABOUT 0.3% TO ABOUT 1.5%) AND CERIUM (AN EFFECTIVE AMOUNT UP TO ABOUT 05%) TO ASSURE HIGH OXIDATION RESISTANCE AND GOOD CORROSION RESISTANCE.
Inventors
- 👤 H Eiselstein
- 👤 J Hosier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:43
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/50; H; H01; H01C; H01C1/00; H01C1/02; H01C1/028
Claims Analysis
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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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |