US2837442A
Expired / Lapsed
US
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Methods of chromizing molybdenum tungsten and their alloys
Assignee: Chromalloy Corp
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Filing: 1955-05-02
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Granted: 1958-06-03
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Expires: 1975-05-02
Abstract
No abstract record available.
Inventors
- 👤 Richard P Seelig
- 👤 Richard L Wachtell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:46
CPC Classifications
C; C23; C23C; C23C24/00; C23C24/08; C23C24/082; C23C24/085; C23C24/087; C23C10/00; C23C10/28; C23C10/34; C23C10/36; C23C10/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
THE METHOD OF APPLYING A SHINY GLOSSY CHROMIUM RICH LAYER ON AN UNDERBASE METAL SELECTED FROM THE CLASS CONSISTING OF MOLYBDENUM, A MOLYBDENUM ALLOY, TUNGSTEN, AND A TUNGSTEN ALLOY WHICH COMPRISES MAINTAINING SAID UNDERBASE METAL AT AN ELEVATED TEMPERATURE OF ABOUT 1900*F. FOR A PERIOD OF SEVERAL HOURS IN A SUBSTANTIALLY OXYGEN-FREE ATMOSPHERE WHILE THE UNDERBASE METAL IS IN THE PRESENCE OF A POWDERED CHROMIZING PACK COMPRISED OF FERRO-CHROME, AN INERT FILLER, A VOLATILE HALIDE AND A MINOR QUANTITY OF FREE IRON, THE AMOUNT OF SAID FREE IRON BEING AT LEAST 3% OF SAID PACK.
Claim 2
Independent Claim
95 words
THE METHOD OF APPLYING A SHINY GLOSSY CHROMIUM RICH LAYER ON AN UNDERBASE METAL SELECTED FROM THE CLASS CONSISTING OF MOLYBDENUM, A MOLYBDENUM ALLOY, TUNGSTEN, AND A TUNGSTEN ALLOY WHICH COMPRISES MAINTAINING SAID UNDERBASE METAL AT AN ELEVATED TEMPERATURE OF ABOUT 1900*F. FOR A PERIOD OF SEVERAL HOURS IN A SUBSTANTIALLY OXYGEN-FREE ATMOSPHERE WHILE THE UNDERBASE METAL IS IN THE PRESENCE OF A POWDERED CHROMIZING PACK COMPRISED OF FERRO-CHROME, AN INERT FILLER, A VOLATILE HALIDE AND A MINOR QUANTITY OF FREE IRON, THE AMOUNT OF SAID FREE IRON BEING AT LEAST 3% OF SAID PACK.
References Cited (Backward Citations)
US2536774A
Cited
US2763921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |