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US3622402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Erosion-corrosion resistant coating
Assignee: Avco Corp
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Filing: 1969-02-04
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Granted: 1971-11-23
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Expires: 1989-02-04
Abstract
Abstract A process for improving the erosion resistance and corrosion resistance of steel articles which comprises boronizing said articles and thereafter coating said boronized articles with chromium under conditions such that the chromium combines with the boron to produce an article bearing a coating containing a boride rich in chromium on the surface of said article.
Inventors
- 👤 Sanford Baranow
- 👤 Richard B Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:12
CPC Classifications
C; C23; C23C; C23C12/00; 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
18 words
The process of claim 1 wherein the boron-containing coating first laid down is at least approximately 0.0001-inches thick.
Claim 2
Dependent Claim
36 words
The process of claim 1 wherein the chromium is diffused into the earlier deposited boron by subjecting the boronized articles to temperatures between about 1,800* F. and 2,100* F. for between about 1 and 16 hours.
Claim 3
Dependent Claim
14 words
An erosion resistant and corrosion resistant article produced by the process of claim 1.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |