US3909241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing free flowing powder and product
Assignee: GTE Sylvania Inc
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Filing: 1973-12-17
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Granted: 1975-09-30
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Expires: 1993-12-17
Abstract
Abstract Free flowing powders such as for flame spray applications are produced by agglomerating finely divided material, classifying the agglomerates to obtain a desired size range, entraining the agglomerates in a carrier gas, feeding the agglomerates through a high temperature plasma reactor to cause at least partial melting of the particles, and collecting the particles in a cooling chamber containing a protective gaseous atmosphere, wherein the particles are solidified.
Inventors
- 👤 Richard F Cheney
- 👤 Frederick J Mower
- 👤 Charles L Moscatello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:37
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/04; B22F1/00; B22F1/06; B22F1/065; B22F1/14; B22F1/148; C; C23; C23C; C23C4/00; C23C4/04; C23C4/06; C23C4/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
75 words
FREE FLOWING FLAME SPRAY POWDER CONSISTING ESSENTIALLY OF SUBSTANTIALLY SPHERICAL PARTICLES OF AN INORGANIC MATERIAL HAVING A MELTING POINT ABOVE 1800*C. THE POWER HAVING AN APPARENT DENSITY OF AT LEAST 40% OF THE THEORETICAL DENSITY OF THE MATERIAL AND A PARTICLE SIZE DISTRIBUTION WITHIN THE RANGE OF ABOUT 60 MICROMETERS, THE POWDER CHARACTERIZED BY PARTICLES HAVING SUBSTANTIALLY SMOOTH NONPOROUS SURFACES AND BY A HALL FLOW WITHIN THE RANGE OF FROM ABOUT 9 TO 21 SECONDS.
Claim 2
Dependent Claim
75 words
FREE FLOWING FLAME SPRAY POWDER CONSISTING ESSENTIALLY OF SUBSTANTIALLY SPHERICAL PARTICLES OF AN INORGANIC MATERIAL HAVING A MELTING POINT ABOVE 1800*C. THE POWER HAVING AN APPARENT DENSITY OF AT LEAST 40% OF THE THEORETICAL DENSITY OF THE MATERIAL AND A PARTICLE SIZE DISTRIBUTION WITHIN THE RANGE OF ABOUT 60 MICROMETERS, THE POWDER CHARACTERIZED BY PARTICLES HAVING SUBSTANTIALLY SMOOTH NONPOROUS SURFACES AND BY A HALL FLOW WITHIN THE RANGE OF FROM ABOUT 9 TO 21 SECONDS.
Claim 3
Dependent Claim
22 words
The powder of claim 1 in which the inorganic material is selected from the group consisting of molybdenum, tungsten and their alloys.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |