Patent US4350604A successfully refreshed from Google Patents.
US4350604A
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Phosphor
Assignee: Mitsubishi Electric Corp
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Filing: 1981-08-28
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Granted: 1982-09-21
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Expires: 2001-08-28
Abstract
Abstract A phosphor having a matrix formulation of Li(Al,Ga)O2 having an atomic ratio of Al to Ga ranging from 75:25 to 5:95, wherein 0.3 to 1.3 atomic percent of Fe3+ ions are additionally incorporated in the matrix as an active component and Li is present in substantially a 1:1 stoichiometric ratio to the total of Al, Ga and Fe. The phosphor so produced is superior to previously disclosed phosphors when used in an optical code reader to read codes from colored paper.
Inventors
- 👤 Kenzo Awazu
- 👤 Kazu Matsunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:58
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/64; C09K11/641
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
58 words
A phosphor having a matrix formulation of Li(Al,Ga)O 2 having an atomic ratio of Al to Ga ranging from 75:25 to 5:95, wherein 0.3 to 1.3 atomic percent of Fe 3+ ions are incorporated in said matrix as an activator and Li is present in substantially a 1:1 stoichiometric ratio to the total of Al, Ga and Fe.
Claim 2
Dependent Claim
58 words
A phosphor having a matrix formulation of Li(Al,Ga)O 2 having an atomic ratio of Al to Ga ranging from 75:25 to 5:95, wherein 0.3 to 1.3 atomic percent of Fe 3+ ions are incorporated in said matrix as an activator and Li is present in substantially a 1:1 stoichiometric ratio to the total of Al, Ga and Fe.
Claim 3
Dependent Claim
37 words
The phosphor according to claim 1, which is obtained by firing a mixture of LiCO 3 , Al 2 O 3 , Ga 2 O 3 and a Fe component at 1300° to 1350° C. in air.
Claim 4
Dependent Claim
29 words
The phosphor according to claim 2, wherein said Fe component is FeCl 3 , Fe(NO 3 ) 3 , or Fe 2 O 3 , or a mixture thereof.
References Cited (Backward Citations)
US3723339A
Cited
US3857054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |