Stainless steels
Abstract
Abstract A CORROSION RESISTANT AND WEAR RESISTANT HIGH STRENGTH FERRITIC-AUSTENITIC STEEL CONSISTING OF: CHROMIUM 23.0-30.0 NICKEL 4.0-7.0 MOLYBDENUM 1.0-5.0 COPPER 1.0-4.0 SILICON 0.2-2.0 MANGANESE 0.2-4.0 CARBON 0.01-0.1 NITROGEN 0.06-0.4 IRON (EXCEPTING UNAVOIDABLE IMPURITIES) BALANCE AND WHEREIN THE CHROMIUM AND NICKEL AND NITROGEN CONTENTS SATISFY THE FOLLOWING FORMULAE: CHROMIUM CONTENT/NICKEL CONTENT = 3.8-6.25 % NICKEL CONTENT + 200XNITROGEN CONTENT/CHROMIUM CONTENT= 0.74-3.72% AND WHEREIN WHEN THE SAID FORMULAE ARE PLOTTED ON A GRAPH WITH FORMULA I PLOTTED AGAINST THE X AXIS AND FORMULA II PLOTTED AGAINST THE Y AXIS, THE VALUES OF THE TWO FORMULAE TAKEN TOGETHER FALL WITHIN THAT AREA OF THE GRAPH BOUNDED BY FOUR STRAIGHT LINES EXTENDING BETWEEN POINTS A, B, C AND D OF THE GRAPH RESPECTIVELY HAVING THE FOLLOWING CO-ORDINATES: X Y A 3.8 3.72 B 6.25 2.96 C 6.25 1.1 D 3.8 0.74
Inventors
- 👤 William Henry Richardson
- 👤 Prodyot Guha
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |