Patent US2797993A successfully refreshed from Google Patents.
US2797993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stainless steel
Assignee: Armco Inc
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Filing: 1956-04-27
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Granted: 1957-07-02
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Expires: 1976-04-27
Abstract
No abstract record available.
Inventors
- 👤 Tanczyn Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:38
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/46; C22C38/44; C22C38/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A CHROMIUM-NICKEL STAINLESS STEEL CAPABLE OF BEING AGE-HARDENED AT BUT MODERATELY ELEVATED TEMPERATURES AND DISPLAYING IN HARDENED CONDITION, EXCELLENT STRENGTH AND CORROSION-RESISTANT PROPERTIES, ALONG WITH FREEDOM FROM DIRECTIONALLITY UNDER ENDURING HIGH TEMPERATURE DUTY, ESSENTIALLY CONSISTING OF CHROMIUM ABOUT 12% TO 18%, NICKEL ABOUT 2.25% AND 5.0%, COPPER ABOUT 2.25% TO 5.00%, MOLYBDENUM ABOUT 1.00% TO 3.50%, BORON UP TO 0.005% MAXIMUM, VANADIUM UP TO 1.0% MAXIMUM, TUNGSTEN UP TO 3.0% MAXIMUM, COLUMBIUM UP TO ABOUT 0.8%, MANGANESE UP TO ABOUT 2.5% MAXIMUM, NITROGEN UP TO ABOUT 0.14%, CARBON UP TO ABOUT 0.10% MAXIMUM, SILICON UP TO ABOUT 1.00% MAXIMUM, PHOSPHORUS AND SULPHUR EACH UP TO ABOUT 0.050% MAXIMUM, AND REMAINDER IRON.
Claim 2
Dependent Claim
111 words
A CHROMIUM-NICKEL STAINLESS STEEL CAPABLE OF BEING AGE-HARDENED AT BUT MODERATELY ELEVATED TEMPERATURES AND DISPLAYING IN HARDENED CONDITION, EXCELLENT STRENGTH AND CORROSION-RESISTANT PROPERTIES, ALONG WITH FREEDOM FROM DIRECTIONALLITY UNDER ENDURING HIGH TEMPERATURE DUTY, ESSENTIALLY CONSISTING OF CHROMIUM ABOUT 12% TO 18%, NICKEL ABOUT 2.25% AND 5.0%, COPPER ABOUT 2.25% TO 5.00%, MOLYBDENUM ABOUT 1.00% TO 3.50%, BORON UP TO 0.005% MAXIMUM, VANADIUM UP TO 1.0% MAXIMUM, TUNGSTEN UP TO 3.0% MAXIMUM, COLUMBIUM UP TO ABOUT 0.8%, MANGANESE UP TO ABOUT 2.5% MAXIMUM, NITROGEN UP TO ABOUT 0.14%, CARBON UP TO ABOUT 0.10% MAXIMUM, SILICON UP TO ABOUT 1.00% MAXIMUM, PHOSPHORUS AND SULPHUR EACH UP TO ABOUT 0.050% MAXIMUM, AND REMAINDER IRON.
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) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |