Patent US4355324A successfully refreshed from Google Patents.
Patent US3249456A successfully refreshed from Google Patents.
US3249456A
Expired / Lapsed
US
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Diffusion coating process
Assignee: Elkem Metals Co LP
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Filing: 1962-11-09
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Granted: 1966-05-03
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Expires: 1982-11-09
Abstract
No abstract record available.
Inventors
- 👤 Michael C Carosella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:17
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/28; C23C10/34; C23C10/36; C23C10/38; C23C10/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A PROCESS FOR PROVIDING A STEEL SUBSTRATE WITH A DIFFUSION ALLOY COATING OF CHROMIUM METAL AND AVOIDING DECARBURIZATION OF STEEL SUBSTRATE WHICH COMPRISES HEATING THE STEEL SUBSTRATE IN INTIMATE CONTACT WITH FERROCHROME HAVING A CARBON CONTENT OF 4-9%, SAID HEATING BEING CONDUCTED AT A PRESSURE OF LESS THAN ABOUT 2,000 MICRONS IN THE TEMPERATURE RANGE OF 1000*C. TO 1500*C. FOR A PERIOD OF TIME SUFFICIENT TO PROVIDE THE DESIRED DEPTH OF ALLOY COATING WHEREBY THE SUBSTRATE IS PROVIDED WITH A DIFFUSION ALLOY COATING OF CHROMIUM AND DECARBURIZATION OF THE STEEL SUBSTRATE IS AVOIDED.
Claim 2
Dependent Claim
93 words
A PROCESS FOR PROVIDING A STEEL SUBSTRATE WITH A DIFFUSION ALLOY COATING OF CHROMIUM METAL AND AVOIDING DECARBURIZATION OF STEEL SUBSTRATE WHICH COMPRISES HEATING THE STEEL SUBSTRATE IN INTIMATE CONTACT WITH FERROCHROME HAVING A CARBON CONTENT OF 4-9%, SAID HEATING BEING CONDUCTED AT A PRESSURE OF LESS THAN ABOUT 2,000 MICRONS IN THE TEMPERATURE RANGE OF 1000*C. TO 1500*C. FOR A PERIOD OF TIME SUFFICIENT TO PROVIDE THE DESIRED DEPTH OF ALLOY COATING WHEREBY THE SUBSTRATE IS PROVIDED WITH A DIFFUSION ALLOY COATING OF CHROMIUM AND DECARBURIZATION OF THE STEEL SUBSTRATE IS AVOIDED.
References Cited (Backward Citations)
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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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |