US3620816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of diffusion coating metal substrates using molten lead as transport medium
Assignee: RAY J VAN THYNE
•
Filing: 1968-10-16
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Granted: 1971-11-16
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Expires: 1988-10-16
Abstract
Abstract A method of diffusing a metallic coating into a metallic substrate using molten lead, in some embodiments, as the transport medium for the metal being deposited. Has particular utility for depositing chromium on a ferrous base substrate to form a relatively high chromium content surface layer thereon. Also quite useful in providing aluminum containing surface zones. Further directed to diffusion alloying with the stabilization of ferritic phase or other means of reducing undesirable surface layer carbide formation.
Inventors
- 👤 John J Rausch
- 👤 Ray J Van Thyne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:19
CPC Classifications
C; C23; C23C; C23C12/00; C23C12/02; C23C10/00; C23C10/18; C23C10/20; C23C10/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
16 words
The process as defined in claim 1 wherein the metal of said first group is chromium.
Claim 2
Dependent Claim
16 words
The process as defined in claim 1 wherein the metal of said first group is aluminum.
Claim 3
Dependent Claim
53 words
The process of diffusion coating a ferrous base substrate which includes the steps of contacting said substrate with a molten aLloy bath consisting essentially of lead and at least one diffusing metal soluble in lead selected from the group consisting of chromium, aluminum, and titanium and diffusing said diffusing metal into said substrate.
Claim 4
Dependent Claim
13 words
The process as defined in claim 4 wherein said diffusing metal is chromium.
Claim 5
Dependent Claim
13 words
The process as defined in claim 4 wherein said diffusing metal is aluminum.
Claim 6
Dependent Claim
13 words
The process as defined in claim 4 wherein said diffusing metal is titanium.
Claim 7
Dependent Claim
45 words
The process of diffusion coating a ferrous base substrate with chromium and nickel which includes the steps of contacting said substrate with a molten alloy bath consisting essentially of lead and the soluble diffusing metals chromium and nickel, and diffusing said metals into said substrate.
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US3481769A
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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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |