US3291747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making doped yttrium oxide phosphors
Assignee: Verizon Laboratories Inc
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Filing: 1965-03-31
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Granted: 1966-12-13
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Expires: 1985-03-31
Abstract
No abstract record available.
Inventors
- 👤 Robert A Lefever
- 👤 Kenneth A Wickersheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:08
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/20; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7701
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS FOR PRODUCING A CATHODOLUMINESCENT PHOSPHOR WHICH COMPRISES THE STEPS OF (A) PREPARING A FIRST HOT ACIDIC SOLUTION CONTAINING APPROXIMATELY 99 MOLE PERCENT YTTRIUM OXIDE AND APPROXIMATELY 1 MOLE PERCENT OF A DOPANT SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM, CADMIUM, COPPER AND THORIUM, (B) REACTING SAID FIRST SOLUTION WITH A SECOND HOT SOLUTION OF OXALIC ACID, (C) ALLOWING THE REACTANTS TO COOL TO PRODUCE AN OXALATE PRECIPITATE OF YTTRIUM AND A DOPANT SELECTED FROM SAID GROUP, AND (D) HEATING SAID OXALATE PRECIPITATE TO CONVERT THE OXALATE TO AN OXIDE OF YTTRIUM INCORPORATING AN ELEMENT FROM SAID GROUP, THE RESULTANT PHOSPHOR EXHIBITING A BLUE-WHITE CATHODOLUMINESCENCE.
Claim 2
Dependent Claim
106 words
A PROCESS FOR PRODUCING A CATHODOLUMINESCENT PHOSPHOR WHICH COMPRISES THE STEPS OF (A) PREPARING A FIRST HOT ACIDIC SOLUTION CONTAINING APPROXIMATELY 99 MOLE PERCENT YTTRIUM OXIDE AND APPROXIMATELY 1 MOLE PERCENT OF A DOPANT SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM, CADMIUM, COPPER AND THORIUM, (B) REACTING SAID FIRST SOLUTION WITH A SECOND HOT SOLUTION OF OXALIC ACID, (C) ALLOWING THE REACTANTS TO COOL TO PRODUCE AN OXALATE PRECIPITATE OF YTTRIUM AND A DOPANT SELECTED FROM SAID GROUP, AND (D) HEATING SAID OXALATE PRECIPITATE TO CONVERT THE OXALATE TO AN OXIDE OF YTTRIUM INCORPORATING AN ELEMENT FROM SAID GROUP, THE RESULTANT PHOSPHOR EXHIBITING A BLUE-WHITE CATHODOLUMINESCENCE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |