US2825658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of chromizing
Assignee: Metal Diffusions Inc
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Filing: 1954-10-04
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Granted: 1958-03-04
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Expires: 1974-10-04
Abstract
No abstract record available.
Inventors
- 👤 George A Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:05
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/28; C23C10/34; C23C10/36; C23C10/38; C23C10/40; C23C10/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
THE METHOD OF CHROMIZING, WHICH COMPRISES TREATING STEEL HAVING A CARBON CONTENT OF 0.35 PERCENT OR LESS WITH EXCLUSION OF AIR AT A TEMPERATURE OF FROM 1650 TO 1950*F. FOR A TIME OF AT LEAST THREE HOURS WITH A SOURCE OF FINELY DIVIDED CHROMIUM AND FROM 0.06 TO 0.26 PER CENT OF THE WEIGHT OF THE CHROMIUM OF AMMONIUM BROMIDE.
Claim 2
Independent Claim
60 words
THE METHOD OF CHROMIZING, WHICH COMPRISES TREATING STEEL HAVING A CARBON CONTENT OF 0.35 PERCENT OR LESS WITH EXCLUSION OF AIR AT A TEMPERATURE OF FROM 1650 TO 1950*F. FOR A TIME OF AT LEAST THREE HOURS WITH A SOURCE OF FINELY DIVIDED CHROMIUM AND FROM 0.06 TO 0.26 PER CENT OF THE WEIGHT OF THE CHROMIUM OF AMMONIUM BROMIDE.
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) | 1961-03-03 | 1961-09-02 | 1962-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-03 | 1965-09-02 | 1966-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-03 | 1969-09-02 | 1970-03-04 | $7700.00 | Window Closed / Lapsed |