US2900244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fine particle production
Assignee: IIT Research Institute
•
Filing: 1954-05-19
•
Granted: 1959-08-18
•
Expires: 1974-05-19
Abstract
No abstract record available.
Inventors
- 👤 Samuel W Bradstreet
- 👤 James S Griffith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:38
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/14; C01B13/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A METHOD OF OBTAINING A FINE POWDER, WHICH COMPRISES APPLYING TO A SURFACE AND ADHERENT THIN CRYPTOCRYSTALLINE METAL OXIDE COATING, THEN HEATING THE COATING IN THE PRESENCE OF A GASEOUS REDUCING ATMOSPHERE TO REDUCE THE METAL OXIDE TO THE METAL, AND THEN MECHANICALLY BREAKING DOWN THE COATING AND REMOVING THE SAME FROM THE SURFACE TO OBTAIN A POWDERED METAL.
Claim 2
Independent Claim
59 words
A METHOD OF OBTAINING A FINE POWDER, WHICH COMPRISES APPLYING TO A SURFACE AND ADHERENT THIN CRYPTOCRYSTALLINE METAL OXIDE COATING, THEN HEATING THE COATING IN THE PRESENCE OF A GASEOUS REDUCING ATMOSPHERE TO REDUCE THE METAL OXIDE TO THE METAL, AND THEN MECHANICALLY BREAKING DOWN THE COATING AND REMOVING THE SAME FROM THE SURFACE TO OBTAIN A POWDERED METAL.
References Cited (Backward Citations)
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US1838359A
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US2327992A
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US2298464A
Cited
US2372367A
Cited
US2585461A
Cited
US2670273A
Cited
US2551341A
Cited
US2739566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |