Patent US2147258A successfully refreshed from Google Patents.
Patent US2531618A successfully refreshed from Google Patents.
US2531618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making fluorescent screens, including the elimination of copper impurities
Assignee: Lanteris Space LLC
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Filing: 1948-10-12
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Granted: 1950-11-28
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Expires: 1968-10-12
Abstract
No abstract record available.
Inventors
- 👤 John J Geoghegan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:45
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
65 words
IN A PROCESS FOR SETTLING PHOSPHOR OUT OF A LIQUID SUSPENSION OF SAID PHOSPHOR, WHICH LIQUID SUSPENSION CONTAINS TRACES OF COPPER IMPURITIES IN NORMALLY INSOLUBLE FORM, THE IMPROVEMENT WHICH CONSISTS IN UTILIZING A SOLUBLE ALKALI CYANIDE DISSOLVED IN THE LIQUID OF SAID SUSPENSION AND EFFECTIVE TO CONVERT THE COPPER IMPURITIES INTO SOLUBLE CUPROCYANIDE COMPLEXES, AND REMOVING THE SUPERNATANT LIQUID AND THE SOLUBLE COMPLEXES INCLUDED THEREIN.
Claim 2
Dependent Claim
65 words
IN A PROCESS FOR SETTLING PHOSPHOR OUT OF A LIQUID SUSPENSION OF SAID PHOSPHOR, WHICH LIQUID SUSPENSION CONTAINS TRACES OF COPPER IMPURITIES IN NORMALLY INSOLUBLE FORM, THE IMPROVEMENT WHICH CONSISTS IN UTILIZING A SOLUBLE ALKALI CYANIDE DISSOLVED IN THE LIQUID OF SAID SUSPENSION AND EFFECTIVE TO CONVERT THE COPPER IMPURITIES INTO SOLUBLE CUPROCYANIDE COMPLEXES, AND REMOVING THE SUPERNATANT LIQUID AND THE SOLUBLE COMPLEXES INCLUDED THEREIN.
Claim 3
Dependent Claim
50 words
IN THE ART OF PRODUCING FLUORESCENT SCREENS, THE STEPS WHICH COMPRISE: PROVIDING AN AQUEOUS SUSPENSION OF PHOSPHOR, SAID SUSPENSION CONTAINING TRACES OF COPPER IMPURITIES IN NORMALLY INSOLUBLE FORM; AND UTILIZING A SOLUBLE ALKALI CYANIDE, DISSOLVED IN THE SUSPENSION LIQUID, TO BRING THE COPPER IMPURITIES INTO SOLUTION AS SOLUBLE CUPROCYANIDE COMPLEXES.
Claim 4
Dependent Claim
50 words
IN THE ART OF PRODUCING FLUORESCENT SCREENS, THE STEPS WHICH COMPRISE: PROVIDING AN AQUEOUS SUSPENSION OF PHOSPHOR, SAID SUSPENSION CONTAINING TRACES OF COPPER IMPURITIES IN NORMALLY INSOLUBLE FORM; AND UTILIZING A SOLUBLE ALKALI CYANIDE, DISSOLVED IN THE SUSPENSION LIQUID, TO BRING THE COPPER IMPURITIES INTO SOLUTION AS SOLUBLE CUPROCYANIDE COMPLEXES.
References Cited (Backward Citations)
US2075399A
Cited
US2219929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |