Patent US3658507A successfully refreshed from Google Patents.
US3658507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of chrome powder
Assignee: Office National d'Études et de Recherches Aérospatiales
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Filing: 1970-02-03
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Granted: 1972-04-25
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Expires: 1990-02-03
Abstract
Abstract A method for the industrial manufacture of chromium powder from chromium oxide powder by reducing the latter with magnesium vapor, including the steps of preparing chromium oxide powder masses of between one and about 10 kilograms, imbedding in each of said masses a magnesium ingot, thermally insulating the masses from each other, and heating the masses to react the magnesium vapor produced by the magnesium ingots with the chromium oxide powder.
Inventors
- 👤 Gilles M Gohin
- 👤 Andre R Hivert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:15
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/32; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20; B22F9/22; C22B5/00; C22B5/02; C22B5/04; C22B5/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
23 words
A method as claimed in claim 1, further comprising the steps of controlling the temperature of said masses during the reduction reaction step.
Claim 2
Dependent Claim
19 words
A method as claimed in claim 2, wherein said temperature control is effected individually with respect to each mass.
Claim 3
Dependent Claim
25 words
A method as claimed in claim 1, wherein said chromium oxide powder is blown prior to being separated into 1 to about 10 kilograms masses.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |