Patent US3000729A successfully refreshed from Google Patents.
US3000729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stainless steel
Assignee: Armco Inc
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Filing: 1959-12-03
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Granted: 1961-09-19
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Expires: 1979-12-03
Abstract
No abstract record available.
Inventors
- 👤 Tanczyn Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:48
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/26; C22C38/60
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
116 words
A STRAIGHT-CHROMIUN STAINLESS STEEL HAVING QUENCHHARDENING PROPERTIES AND WHEREIN TEMPER HARDNESS CAN BE CLOSELY CONTROLLED WITHIN REQUIRED VALUE WHEREIN IMPROVED TOUGHNESS AND STRENGTH ARE HAD IN THE HARDENED AND TEMPERED CONDITION, SAID STEEL COMPRISING ABOUT 10.0% TO 14.0% CHROMIUM, ABOUT 0.07% TO 0.14% CARBON, ABOUT 0.10% TO 1.25% MANGANESE, ABOUT 0.001% TO 0.050% PHOSPHROUS. ABOUT 0.001% TO 0.050% SULPHUR, ABOUT 0.10% TO 1.00% SILICON, NICKEL UP TO 1.00% COLUMBIUM AND TANTALUM TOGETHER IN THE AMOUNT OF 0.05% TO 0.35%, CANADIUM ABOUT 0.05% TO 0.15%, WITH COLUMBIUM AND TANTALUM TOGETHER WITH VANADIUM IN SUM TOTAL ABOUT .05% TO .35%, AND UP TO ABOUT THREE TIMES THE CARBON CONTENT OF THE STEEL, AND THE REMAINDER SUBSTANTIALLY ALL IRON.
References Cited (Backward Citations)
US2469887A
Cited
GB741935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |