Patent US3929473A successfully refreshed from Google Patents.
US3929473A
Expired / Lapsed
US
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Chromium, molybdenum ferritic stainless steels
Assignee: EIDP Inc
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Filing: 1974-05-30
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Granted: 1975-12-30
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Expires: 1994-05-30
Abstract
Abstract A ferritic alloy containing, in general ranges, 27-32.50% chromium, 1.8-5.8% molybdenum, 0.25-3.0 nickel, 100 ppm carbon maximum, 200 ppm nitrogen maximum, the sum of carbon plus nitrogen being 250 ppm maximum, having inherent post-welding ductility and high corrosion resistance.
Inventors
- 👤 Michael A Streicher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:52
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/44
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
39 words
A CORROSION-RESISTANT FERRITIC IRON-CHROMIUM-MOLYBDENUM ALLOY HAVING GOOD POST-WELDING DUCTILITY CONSISTING ESSENTIALLY OF CHROMIUM AND MOLYBDENUM IN THE WEIGHT PERCENTAGES WITHIN AREAS A2 AND C2 OF FIG. 1, 0.25-3.0 WEIGHT PER CENT NI, CARBON 100 PPM MAXIMUM, NITROGEN 200 PPM
Claim 2
Dependent Claim
39 words
A CORROSION-RESISTANT FERRITIC IRON-CHROMIUM-MOLYBDENUM ALLOY HAVING GOOD POST-WELDING DUCTILITY CONSISTING ESSENTIALLY OF CHROMIUM AND MOLYBDENUM IN THE WEIGHT PERCENTAGES WITHIN AREAS A2 AND C2 OF FIG. 1, 0.25-3.0 WEIGHT PER CENT NI, CARBON 100 PPM MAXIMUM, NITROGEN 200 PPM
Claim 3
Dependent Claim
15 words
A corrosion-resistant ferritic iron-chromium-molybdenum alloy according to claim 1 incorporating 28.5-30.5% Cr and 3.5-4.5% Mo.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |