Patent US2536774A successfully refreshed from Google Patents.
US2536774A
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US
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Process of coating ferrous metal and heat pack mixture therefor
Assignee: Diffusion Alloys Corp
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Filing: 1949-08-26
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Granted: 1951-01-02
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Expires: 1969-08-26
Abstract
No abstract record available.
Inventors
- 👤 Samuel Robert Lionel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:23
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/28; C23C10/34; C23C10/36; C23C10/38; C23C10/40; C23C10/42; C23C10/52; C23C10/54; C23C10/56
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
112 words
IN A PROCESS OF APPLYING A METAL SELECTED FROM THE GROUP CONSISTING OF CHROMIUM, TUNGSTEN AND MOLYBDENUM TO A FERROUS METAL STRUCTURE BY THE STEPS OF EMBEDDING AND ENCLOSING SAID STRUCTURE IN POWDERED MATERIAL, WHICH MATERIAL CONSISTS ESSENTIALLY OF SUCH METAL, IRON, A SOURCE OF GASEOUS HALOGEN AND A REFRACTORY SUBSTANCE, AND HEAT TREATING THE EMBEDDED STRUCTURE IN AN ATMOSPHERE SUBSTANTIALLY FREE FROM OXYGEN; THE COMBINATION IN WHICH THE REFRACTORY SUBSTANCE IS UNBAKED, UNVITRIFIED KAOLIN, THE SOURCE OF GASEOUS HALOGEN IS SELECTED FROM THE GROUP CONSISTING OF IODINE AND AMMONIUM IODIDE, AND THE HEATING STEP IS CARRIED OUT AT A TEMPERATURE BETWEEN 800* AND 1300* C. FOR FROM 4 TO 12 HOURS.
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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) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |