US3759705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromium containing alloy steel and articles
Assignee: Armco Inc
•
Filing: 1971-06-10
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Granted: 1973-09-18
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Expires: 1991-06-10
Abstract
Abstract ALLOY STEEL SUITED TO ELEVATE-TEMPERATURE APPLICATIONS AND SHEET, STRIP, AND THE LIKE FASHIONED OF THE SAME OF READY FORMABILITY AND COMPARATIVELY LOW COST CONTAINING ABOUT 16% TO 19% CHROMIUM, SILICON ABOUT .5% TO ABOUT 1.6% TO ABOUT 2.7% WITH THE SUM OF THE SILICON AND ALUMINUM CONTENTS NOT EXCEEDING 3.9%, CARBON NOT OVER .1% AND PREFERABLY LESS THAN .07%, MANGANESE UP TO ABOUT 1% BUT PREFERABLY LESS THAN .50% NITROGEN UP TO ABOUT .05%, ABOUT .15% TO ABOUT .8% TITANIUM AND/OR ABOUT .15% TO ABOUT 1.25% COLUMBIUM, AND REMAINDER SUBSTANTIALLY ALL IRON.
Inventors
- 👤 D Chalk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:10
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/28; C22C38/26
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |