US4071465A
Expired / Lapsed
US
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Deep-red emitting phosphor
Assignee: Philips North America LLC
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Filing: 1977-04-18
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Granted: 1978-01-31
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Expires: 1997-04-18
Abstract
Abstract A luminescent composition excited by ultraviolet or selected visible wavelength radiations consisting essentially of aluminum oxide-germanium dioxide matrix activated by chromium. The composition provides strong line emissions in the deep red.
Inventors
- 👤 Frank M. Vodoklys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:22
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/67; C09K11/68; C09K11/681
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
58 words
A luminescent composition which can be excited to luminescence by ultraviolet or by visible wavelength radiations of deep violet or green to emit in the deep red, said composition consisting essentially of Al 2 O 3 .sup.. xGeO 2 :yCr, wherein "x" is from about 0.012 to about 0.20 and "y" is from about 0.006 to about 0.035.
Claim 2
Dependent Claim
58 words
A luminescent composition which can be excited to luminescence by ultraviolet or by visible wavelength radiations of deep violet or green to emit in the deep red, said composition consisting essentially of Al 2 O 3 .sup.. xGeO 2 :yCr, wherein "x" is from about 0.012 to about 0.20 and "y" is from about 0.006 to about 0.035.
Claim 3
Dependent Claim
13 words
The luminescent composition of claim 1, wherein "x" is from 0.05 to 0.10.
Claim 4
Dependent Claim
13 words
The luminescent composition of claim 1, wherein "y" is from 0.015 to 0.025.
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) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |