Patent US3438439A successfully refreshed from Google Patents.
Patent US2638424A successfully refreshed from Google Patents.
US2638424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of processing metal powders
Assignee: American Electro Metal Corp
•
Filing: 1946-02-09
•
Granted: 1953-05-12
•
Expires: 1966-02-09
Abstract
No abstract record available.
Inventors
- 👤 Fritz J Hansgirg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:31
CPC Classifications
B; B22; B22F; B22F1/00; B22F1/14; B22F1/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
THE METHOD OF CLEANING LIGHT POWDERY PARTICLES OF METAL SELECTED FROM THE CLASS CONSISTING OF ALUMINUM AND MAGNESIUM AND HAVING METAL COMPOUND SURFACE IMPURITIES WHICH ARE REMOVABLE BY NITRIC ACID, WHICH COMPRISES THE STEPS OF REACTING UPON A FLUID MIXTURE CONTAINING WATER AND SAID POWDERY PARTICLES WITH CONCENTRATED NITRIC ACID SO AS TO REMOVE METAL COMPOUNDS FROM THE SURFACES OF SAID PARTICLES AND THUS PRODUCE ON SAID PARTICLES CLEANED SURFACE LAYERS, EFFECTIVELY INTERRUPTING IMMEDIATELY THEREAFTER SAID REACTION BY EFFECTIVELY REMOVING THE POWDERY PARTICLES FROM THE ACTION OF THE CONCENTRATED ACID, AND THEREAFTER SEPARATING SAID PARTICLES FROM THE RESULTING MIXTURE UNDER CONDITIONS EXCLUDING THE ACCESS OF AIR.
Claim 2
Independent Claim
106 words
THE METHOD OF CLEANING LIGHT POWDERY PARTICLES OF METAL SELECTED FROM THE CLASS CONSISTING OF ALUMINUM AND MAGNESIUM AND HAVING METAL COMPOUND SURFACE IMPURITIES WHICH ARE REMOVABLE BY NITRIC ACID, WHICH COMPRISES THE STEPS OF REACTING UPON A FLUID MIXTURE CONTAINING WATER AND SAID POWDERY PARTICLES WITH CONCENTRATED NITRIC ACID SO AS TO REMOVE METAL COMPOUNDS FROM THE SURFACES OF SAID PARTICLES AND THUS PRODUCE ON SAID PARTICLES CLEANED SURFACE LAYERS, EFFECTIVELY INTERRUPTING IMMEDIATELY THEREAFTER SAID REACTION BY EFFECTIVELY REMOVING THE POWDERY PARTICLES FROM THE ACTION OF THE CONCENTRATED ACID, AND THEREAFTER SEPARATING SAID PARTICLES FROM THE RESULTING MIXTURE UNDER CONDITIONS EXCLUDING THE ACCESS OF AIR.
References Cited (Backward Citations)
US1314709A
Cited
US1054102A
Cited
GB126881A
Cited
US1415461A
Cited
DE469534C
Cited
US1795473A
Cited
US1891549A
Cited
US2068640A
Cited
US2207346A
Cited
US2356807A
Cited
US2437220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |