US3983303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing articles from metal coated with a zirconium nitride layer
Assignee: US Philips Corp
•
Filing: 1975-03-27
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Granted: 1976-09-28
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Expires: 1995-03-27
Abstract
Abstract A method of manufacturing metal parts containing an element which is attacked by lead comprising coating the metal parts with zirconium nitride by treatment with a zirconium-containing metal melt.
Inventors
- 👤 Udo Klaus Paul Biermann
- 👤 Brian Lynch
- 👤 Willibrordus Maria VAN DE Wijgert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:45
CPC Classifications
C; C23; C23C; C23C12/00; C23C10/00; C23C10/18; C23C10/20; C23C10/22; Y; Y10; Y10S; Y10S376/00; Y10S376/90; Y10T; Y10T428/00; Y10T428/13; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
A method of manufacturing a metal article having parts which are subject to the influence of a metal melt containing lead which attacks constituents of the metal parts comprising the steps subjecting an austenitic alloy containing at least 5% by weight of nickel and having at least on the surface thereof nitrogen to the action of a metal melt containing zirconium in molten lead at a temperature of at least 800° C to form a layer of zirconium nitride on said alloy which
Claim 2
Independent Claim
83 words
A method of manufacturing a metal article having parts which are subject to the influence of a metal melt containing lead which attacks constituents of the metal parts comprising the steps subjecting an austenitic alloy containing at least 5% by weight of nickel and having at least on the surface thereof nitrogen to the action of a metal melt containing zirconium in molten lead at a temperature of at least 800° C to form a layer of zirconium nitride on said alloy which
Claim 3
Dependent Claim
32 words
A method as claimed in claim 1 in which the alloy consists of 18% by weight of Cr, 11% by weight of Ni, 0.03% by weight of C, 0.2% by weight of
Claim 4
Dependent Claim
88 words
A method as claimed in claim 1 in which the alloy consists of 19 to 20% by weight of Ni, 18.5 to 21% by weight of Co, 20 to 22.5% by weight of Cr, 2.5 to 3.5% by weight of Mo, 2 to 3% by weight of W, 0.08 to 0.16% by weight of C, 0.10 to 0.20% by weight of N, 0.75 to 1.25% by weight of Nb + Ta, at least 1% by weight of Si, 1 to 2% by weight of Mn and the remainder
Claim 5
Dependent Claim
30 words
Articles resistant to corrosion by exposure to molten lead consisting essentially of an austenitic alloy containing more than 5% by weight of nickel and a coating thereon of zirconium nitride.
Claim 6
Dependent Claim
30 words
Articles resistant to corrosion by exposure to molten lead consisting essentially of an austenitic alloy containing more than 5% by weight of nickel and a coating thereon of zirconium nitride.
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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |