Patent US2855332A successfully refreshed from Google Patents.
US2855332A
Expired / Lapsed
US
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Method of chromizing ferrous metal
Assignee: Metal Diffusions Inc
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Filing: 1954-09-07
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Granted: 1958-10-07
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Expires: 1974-09-07
Abstract
No abstract record available.
Inventors
- 👤 George A Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:23
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/18; C23C10/20; C23C10/24; C23C10/28; C23C10/30; C23C10/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
THE METHOD OF CHROMIZING, WHICH COMPRISES REACTING AMMONIUM BIFLUORIDE WITH CHROMIUM IN WATERY SOLUTION TO FORM A COMPLEX AMMONIUM CHROMIUM FLUORIDE, WITH AN EXCESS OF CHROMIUM, COATING THE WATERY DISPERSION THUS FORMED ON A FERROUS METAL ARTICLE TO BE CHROMIZED, AND HEATING THE ARTICLE WITH EXCLUSION OF AIR AT A TEMPERATURE OF FROM 1650 TO 1950 DEGREES F. FOR A TIME OF AT LEAST THREE HOURS.
Claim 2
Independent Claim
66 words
THE METHOD OF CHROMIZING, WHICH COMPRISES REACTING AMMONIUM BIFLUORIDE WITH CHROMIUM IN WATERY SOLUTION TO FORM A COMPLEX AMMONIUM CHROMIUM FLUORIDE, WITH AN EXCESS OF CHROMIUM, COATING THE WATERY DISPERSION THUS FORMED ON A FERROUS METAL ARTICLE TO BE CHROMIZED, AND HEATING THE ARTICLE WITH EXCLUSION OF AIR AT A TEMPERATURE OF FROM 1650 TO 1950 DEGREES F. FOR A TIME OF AT LEAST THREE HOURS.
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) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |