US4168333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective chromizing in a molten lead medium
Assignee: Individual
•
Filing: 1977-10-07
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Granted: 1979-09-18
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Expires: 1997-10-07
Abstract
Abstract A ferrous based substrate is diffusion coated by contacting the substrate with a molten alloy bath consisting essentially of lead and chromium, wherein the quantity of chromium is less than 0.85% of the weight of the lead.
Inventors
- 👤 John J. Rausch
- 👤 Ray J. Van Thyne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:27
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/18; C23C10/20; C23C10/22; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12854
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
56 words
A process of diffusion coating a ferrous-based substrate comprising: contacting said substrate with a molten alloy bath consisting essentially of lead and chromium as a surface-diffusing element, lead being the only transfer agent in said bath, said bath containing less than 0.85% chromium by bath weight of said lead, and diffusing said chromium into said substrate.
Claim 2
Dependent Claim
56 words
A process of diffusion coating a ferrous-based substrate comprising: contacting said substrate with a molten alloy bath consisting essentially of lead and chromium as a surface-diffusing element, lead being the only transfer agent in said bath, said bath containing less than 0.85% chromium by bath weight of said lead, and diffusing said chromium into said substrate.
Claim 3
Dependent Claim
16 words
The process of claim 1, wherein the only surface diffusing element in said bath is chromium.
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) | 1982-09-17 | 1983-03-19 | 1983-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-17 | 1987-03-19 | 1987-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-17 | 1991-03-19 | 1991-09-18 | $7700.00 | Window Closed / Lapsed |