US4028094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stainless steel powder
Assignee: Allegheny Ludlum Corp
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Filing: 1975-10-29
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Granted: 1977-06-07
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Expires: 1995-10-29
Abstract
Abstract Atomized, prealloyed stainless steel powder having an apparent density of at least 2.0 g./cu.cm. The steel consists essentially of, by weight, up to 0.3% carbon, up to 2.0% manganese, up to 0.05% phosphorus, up to 0.04% sulfur, up to 2.0% silicon, 17.5 to 18.0% chromium, 10.0 to 14.0% nickel, 2.5 to 3.0% molybdenum, balance iron and residuals.
Inventors
- 👤 Orville W. Reen
- 👤 Donald J. McMahon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:45
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/44; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
78 words
Atomized, prealloyed stainless steel powder consisting essentially of, by weight, up to 0.03% carbon, up to 2.0% manganese, up to 0.05% phosphorus, up to 0.04% sulfur, up to 2.0% silicon, 17.5 to 18.0% chromium, 10.0 to 14.0% nickel, 2.5 to 3.0% molybdenum, balance iron and residuals; said powder having an apparent density of at least 2.0 g./cu.cm.; said powder being suitable for use in the manufacture of sintered powder parts requiring superior corrosion resistance to the chloride ion.
Claim 2
Dependent Claim
78 words
Atomized, prealloyed stainless steel powder consisting essentially of, by weight, up to 0.03% carbon, up to 2.0% manganese, up to 0.05% phosphorus, up to 0.04% sulfur, up to 2.0% silicon, 17.5 to 18.0% chromium, 10.0 to 14.0% nickel, 2.5 to 3.0% molybdenum, balance iron and residuals; said powder having an apparent density of at least 2.0 g./cu.cm.; said powder being suitable for use in the manufacture of sintered powder parts requiring superior corrosion resistance to the chloride ion.
Claim 3
Dependent Claim
15 words
Atomized, prealloyed stainless steel powder according to claim 1, having from 17.60 to 17.85% chromium.
Claim 4
Dependent Claim
15 words
Atomized, prealloyed stainless steel powder according to claim 1, having from 2.60 to 2.85% molybdenum.
Claim 5
Dependent Claim
15 words
Atomized, prealloyed stainless steel powder according to claim 1, having from 12.75 to 13.6% nickel.
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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |