Patent US4304578A successfully refreshed from Google Patents.
US3301791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Red luminescent composition product and process
Assignee: EIDP Inc
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Filing: 1965-04-30
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Granted: 1967-01-31
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Expires: 1985-04-30
Abstract
No abstract record available.
Inventors
- 👤 Lothar H Brixner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:02
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7784; C09K11/7787
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
IN A PROCESS FOR THE PRODUCTION OF RED LUMINESCENT COMPOSITIONS OF THE GENERIC FORMULA AB1-XEUXO2 WHERE A IS A MONOVALENT METAL HAVING AN ATOMIC NUMBER IN THE RANGE OF 3 THROUGH 11, INCLUSIVE, AND B IS AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF YTTRIUM AND GADOLINIUM, AND X HAS A VALUE OF FROM 0.01 TO 0.2, INCLUSIVE, THE STEPS COMPRISING (A) INTIMATELY MIXING IN STOICHIOMETRIC AMOUNTS, AT LEAST ONE COMPOUND OF EACH OF THE METALS OF THE GENERIC FORMULA, SAID COMPOUNDS BEING SELECTED FROM THE GROUP CONSISTING OF THE OXIDES OF SAID METALS AND COMPOUNDS WHICH UPON HEATING AT 800 TO 1000*C. FORM SAID OXIDES, (B) FIRING THE MIXTURE AT A TEMPERATURE OF FROM 800* TO 1000*C. FOR A PERIOD OF FROM 10 TO 14 HOURS; (C) SUBJECTING THE FIRED PRODUCT TO COMMINUTION AND REMIXING; AND (D) FIRING SAID COM-
Claim 2
Dependent Claim
141 words
IN A PROCESS FOR THE PRODUCTION OF RED LUMINESCENT COMPOSITIONS OF THE GENERIC FORMULA AB1-XEUXO2 WHERE A IS A MONOVALENT METAL HAVING AN ATOMIC NUMBER IN THE RANGE OF 3 THROUGH 11, INCLUSIVE, AND B IS AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF YTTRIUM AND GADOLINIUM, AND X HAS A VALUE OF FROM 0.01 TO 0.2, INCLUSIVE, THE STEPS COMPRISING (A) INTIMATELY MIXING IN STOICHIOMETRIC AMOUNTS, AT LEAST ONE COMPOUND OF EACH OF THE METALS OF THE GENERIC FORMULA, SAID COMPOUNDS BEING SELECTED FROM THE GROUP CONSISTING OF THE OXIDES OF SAID METALS AND COMPOUNDS WHICH UPON HEATING AT 800 TO 1000*C. FORM SAID OXIDES, (B) FIRING THE MIXTURE AT A TEMPERATURE OF FROM 800* TO 1000*C. FOR A PERIOD OF FROM 10 TO 14 HOURS; (C) SUBJECTING THE FIRED PRODUCT TO COMMINUTION AND REMIXING; AND (D) FIRING SAID COM-
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) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |