Patent US3955578A successfully refreshed from Google Patents.
US3152020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fracture tough ultra high strength steel sheets
Assignee: United States Steel Corp
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Filing: 1961-05-11
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Granted: 1964-10-06
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Expires: 1981-05-11
Abstract
No abstract record available.
Inventors
- 👤 John H Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:07
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/24; Y; Y10; Y10S; Y10S148/00; Y10S148/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
FRACTURE TOUGH ULTRA HIGH STRENGTH STEEL ALLOY SHEET ADAPTED FOR FABRICATION INTO PRESSURE VESSELS, SAID SHEET HAVING A MINIMUM THICKNESS OF ABOUT 0.072 INCH, AN AMBIENT TERMPERATURE UNIAXIAL YIELD STRENGTH OF AT LEAST 200,000 P.S.I., AND A FRACTURE TOUGHNESS OF AT LEAST 140,000 P.S.I. $INCH, THE LATTER BEING IMPARTED BY DECARBURIZED SURFACE HAVING A DEPTH OF BETWEEN 0.010 INCH AND 0.024 INCH, THE STEEL OF SAID SHEET BENEATH THE DECARBURIZED SURFACE HAVING A CARBON CONTENT OF AT LEAST 0.25%, SAID CARBON CONTENT BEING SUBSTANTIALLY HIGHER THAN THAT OF SAID SURFACE, AND SAID SHEET HAVING SUBSTANTIALLY BETWEEN 3% AND 7% OF ALLOYING ELEMENTS, SAID ALLOYING ELEMENTS COMPRISING 0.79% TO 0.99% MANGANESE, 0.009% TO 0.016% PHOSPHORUS, 0.009% TO 0.016% SULPHUR, 1.41% TO 1.68% SILICON, UP TO 1.72% NICKEL, 0.80% TO 1.98% CHROMIUM, UP TO 0.40% MOLYBDENUM, AND 0.05% TO 0.11% VANADIUM.
Claim 2
Dependent Claim
139 words
FRACTURE TOUGH ULTRA HIGH STRENGTH STEEL ALLOY SHEET ADAPTED FOR FABRICATION INTO PRESSURE VESSELS, SAID SHEET HAVING A MINIMUM THICKNESS OF ABOUT 0.072 INCH, AN AMBIENT TERMPERATURE UNIAXIAL YIELD STRENGTH OF AT LEAST 200,000 P.S.I., AND A FRACTURE TOUGHNESS OF AT LEAST 140,000 P.S.I. $INCH, THE LATTER BEING IMPARTED BY DECARBURIZED SURFACE HAVING A DEPTH OF BETWEEN 0.010 INCH AND 0.024 INCH, THE STEEL OF SAID SHEET BENEATH THE DECARBURIZED SURFACE HAVING A CARBON CONTENT OF AT LEAST 0.25%, SAID CARBON CONTENT BEING SUBSTANTIALLY HIGHER THAN THAT OF SAID SURFACE, AND SAID SHEET HAVING SUBSTANTIALLY BETWEEN 3% AND 7% OF ALLOYING ELEMENTS, SAID ALLOYING ELEMENTS COMPRISING 0.79% TO 0.99% MANGANESE, 0.009% TO 0.016% PHOSPHORUS, 0.009% TO 0.016% SULPHUR, 1.41% TO 1.68% SILICON, UP TO 1.72% NICKEL, 0.80% TO 1.98% CHROMIUM, UP TO 0.40% MOLYBDENUM, AND 0.05% TO 0.11% VANADIUM.
References Cited (Backward Citations)
US2241369A
Cited
US2679466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-06 | 1968-04-06 | 1968-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-06 | 1972-04-06 | 1972-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-06 | 1976-04-06 | 1976-10-06 | $7700.00 | Window Closed / Lapsed |