US5202777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal light value in combination with cathode ray tube containing a far-red emitting phosphor
Assignee: Victor Company of Japan Ltd
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Filing: 1992-04-01
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Granted: 1993-04-13
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Expires: 2012-04-01
Abstract
Abstract A far-red emitting phosphor for cathode ray tubes used in liquid crystal light valves comprises Y3-yGdyAl5-xGaxO12:A, where x ranges from 0 to 5, y ranges from 0 to 3, and A is selected from the group consisting of chromium, iron, vanadium, neodymium, dysprosium, cobalt, nickel, titanium or combination thereof.
Inventors
- 👤 Esther Sluzky
- 👤 Mary A. Lemoine
- 👤 Kenneth R. Hesse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:07
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7708; C09K11/7701; C09K11/7706; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/7774; C09K11/7776; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/135
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
In combination, a liquid crystal light valve including a photosensitive layer consisting essentially of hydrogened amorphous silicon and a cathode ray tube containing a far-red emitting phosphor operatively coupled thereto, characterized in that said phosphor consists essentially of Y 3-y Gd y Al 5-x Ga x -O 12 :A, where x has a value within the range of from 0 to 5, y has a value within the range of from 0 to 3, and A is at least one of chromium and neodymium, where chromium has a value within the range of about 0.33 to 2 at% and neodymium has a value of about 1 at%.
Claim 2
Dependent Claim
107 words
In combination, a liquid crystal light valve including a photosensitive layer consisting essentially of hydrogened amorphous silicon and a cathode ray tube containing a far-red emitting phosphor operatively coupled thereto, characterized in that said phosphor consists essentially of Y 3-y Gd y Al 5-x Ga x -O 12 :A, where x has a value within the range of from 0 to 5, y has a value within the range of from 0 to 3, and A is at least one of chromium and neodymium, where chromium has a value within the range of about 0.33 to 2 at% and neodymium has a value of about 1 at%.
Claim 3
Dependent Claim
9 words
The combination of claim 1, wherein A is chromium.
Claim 4
Dependent Claim
11 words
The combination of claim 1, wherein x=0 y=0, A is chromium.
Claim 5
Dependent Claim
11 words
The combination of claim 1, wherein x=5, y=3, A is chromium.
Claim 6
Dependent Claim
11 words
The combination of claim 1, wherein x=2, y=0, A is chromium.
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) | 1996-04-12 | 1996-10-12 | 1997-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-12 | 2000-10-12 | 2001-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-12 | 2004-10-12 | 2005-04-13 | $7700.00 | Window Closed / Lapsed |