US3058807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing phosphor grade metal sulfides
Assignee: EIDP Inc
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Filing: 1959-03-05
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Granted: 1962-10-16
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Expires: 1979-03-05
Abstract
No abstract record available.
Inventors
- 👤 Holland Russell Sedgwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:46
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/56; C09K11/562; C09K11/565
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
PROCESS FOR PREPARING PHOPHOR GRADE METAL SULFIDES WHICH COMPRISES MAINTAINING A SATURATED AQUEOUS SOLUTION OF HYDROGEN SULFIDE, DISPLACING SUBSTANTIALLY ALL AIR FROM CONTACT WITH SAID SOLUTION, ADDING THERETO AN AQUEOUS SOLUTION CONTAINING FROM 1 TO 4 MOLAR CONCENTRATION OF AT LEAST ONE METAL ION OF AN INORGANIC SALT SELECTED FROM THE GROUP CONSISTING OF ZINC AND CADMIUM IONS AT A RATE OF FROM 0.5 TO 5.0 PERCENT PER MINUTE, BASED ON THE TOTAL AMOUNT OF METAL IONS ADDED, THE AMOUNT OF SAID AQUEOUS HYDROGEN SULFIDE SOLUTION BEING FROM 300 TO 1500 ML, PER GRAMATOM OF TOTAL METAL IONS ADDED, AND SEPARATING THE PRECIPITATED METAL SULFIDES.
Claim 2
Dependent Claim
105 words
PROCESS FOR PREPARING PHOPHOR GRADE METAL SULFIDES WHICH COMPRISES MAINTAINING A SATURATED AQUEOUS SOLUTION OF HYDROGEN SULFIDE, DISPLACING SUBSTANTIALLY ALL AIR FROM CONTACT WITH SAID SOLUTION, ADDING THERETO AN AQUEOUS SOLUTION CONTAINING FROM 1 TO 4 MOLAR CONCENTRATION OF AT LEAST ONE METAL ION OF AN INORGANIC SALT SELECTED FROM THE GROUP CONSISTING OF ZINC AND CADMIUM IONS AT A RATE OF FROM 0.5 TO 5.0 PERCENT PER MINUTE, BASED ON THE TOTAL AMOUNT OF METAL IONS ADDED, THE AMOUNT OF SAID AQUEOUS HYDROGEN SULFIDE SOLUTION BEING FROM 300 TO 1500 ML, PER GRAMATOM OF TOTAL METAL IONS ADDED, AND SEPARATING THE PRECIPITATED METAL SULFIDES.
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) | 1965-10-15 | 1966-04-16 | 1966-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-15 | 1970-04-16 | 1970-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-15 | 1974-04-16 | 1974-10-16 | $7700.00 | Window Closed / Lapsed |