US3740342A
Expired / Lapsed
US
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Method for separating chemicallyoxidizable phosphor particles from mixtures with essentially nonoxidizable phosphor particles
Assignee: RCA Licensing Corp
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Filing: 1971-07-26
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Granted: 1973-06-19
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Expires: 1991-07-26
Abstract
Abstract TO SEPARATE CHEMICALLY-OXIDIZABLE PHOSPHOR PARTICLES, SUCH AS ZINC SULFIDE AND ZINC-CADMIUM SULFIDE PHOSPHOR PARTICLES, FROM A MIXTURE WITH ESSENTIALLY NONOXIDIZABLE PHOSPHOR PARTICLES SUCH AS YTTRIUM OXYSULFIDE PHOSPHOR PARTICLES, PRODUCE AN AQUEOUS SLURRY CONTAINING THE MIXTURE OF PARTICLES AND ABOUT 12 TO 22 WEIGHT PRECENT NITRIC ACIT. THE NITRIC ACID REACTS WITH THE OXIDIZABLE PHOSPHOR PARTICLES PRODUCING GAS BUBBLES, WHICH CAUSE THE OXIDIZABLE PARTICLES TO RISE AND TO FLOAT ON THE SURFACE OF THE SLURRY. THE FLOATED PARTICLES ARE REMOVED BY DECANTATION, SKIMMING OR OTHER TECHNIQUE.
Inventors
- 👤 R Platt
- 👤 Cue B Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:59
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/01; C01; C01F; C01F17/00; C01F17/20; C01F17/288; C01F17/294; C09K11/08; C09K11/56; C09K11/562; C09K11/565; Y; Y02; Y02W; Y02W30/00; Y02W30/50
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |