Patent US2990267A successfully refreshed from Google Patents.
US2990267A
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Preparation of metal powders
Assignee: Dow Chemical Co
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Filing: 1959-06-26
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Granted: 1961-06-27
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Expires: 1979-06-26
Abstract
No abstract record available.
Inventors
- 👤 John J Grebe
- 👤 John F Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:05
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/24; C; C21; C21B; C21B13/00; C21B13/008; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
AN IMPROVED METHOD FOR THE PRODUCTION OF FINELY DIVIDED METALS OF THOSE METALLIC ELEMENTS HAVING A STANDARD ELECTRODE POTENTIAL FALLING BETWEEN ABOUT 1.2 AND ABOUT MINUS 0.85, WHICH COMPRISES: CONTACTING AN OXIDIZED FORM OF SAID METAL AND A SILICATE FLUXING AGENT WITH AN ALKALI METAL HYDROXIDE AND A SOLID CARBONACEOUS REDUCING AGENT AT TEMPERATURES FROM ABOUT 450 TO ABOUT 1225* CENTIGRADE FOR A PERIOD OF TIME SUFFICIENT TO YIELD THE METAL IN THE FORM OF A NETWORK OF FINELY DIVIDED PARTICLES SUSPENDED IN A CONTINUOUS, FUSED GLASS-LIKE THERMOPLASTIC SLAG, COOLING THE MIXTURE TO ENTRAP THE METAL PARTICLES
Claim 2
Dependent Claim
97 words
AN IMPROVED METHOD FOR THE PRODUCTION OF FINELY DIVIDED METALS OF THOSE METALLIC ELEMENTS HAVING A STANDARD ELECTRODE POTENTIAL FALLING BETWEEN ABOUT 1.2 AND ABOUT MINUS 0.85, WHICH COMPRISES: CONTACTING AN OXIDIZED FORM OF SAID METAL AND A SILICATE FLUXING AGENT WITH AN ALKALI METAL HYDROXIDE AND A SOLID CARBONACEOUS REDUCING AGENT AT TEMPERATURES FROM ABOUT 450 TO ABOUT 1225* CENTIGRADE FOR A PERIOD OF TIME SUFFICIENT TO YIELD THE METAL IN THE FORM OF A NETWORK OF FINELY DIVIDED PARTICLES SUSPENDED IN A CONTINUOUS, FUSED GLASS-LIKE THERMOPLASTIC SLAG, COOLING THE MIXTURE TO ENTRAP THE METAL PARTICLES
References Cited (Backward Citations)
US739116A
Cited
US2860044A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |