US4038203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Certain alkali metal-rare earth metaphosphate photoluminescent glasses
Assignee: RCA Corp
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Filing: 1976-05-21
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Granted: 1977-07-26
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Expires: 1996-05-21
Abstract
Abstract High intensity photoluminescent glasses comprising certain alkali metal-rare earth metaphosphates are suitable for use in display panels, indicator lights, and decorative illumination, etc. These glasses, with a suitable activator, have the formula: [n{(1-x)M.sub.2 0.2xQ.P.sub.2 O.sub.5 }][1-y)Y.sub.2 O.sub.3.yR.sub.2 O 3 .3P 2 O 5 ] where n is from two to siz, x is from 0 to 0.2 and y is from 0 to 1; M is an alkali metal; Q is a thallium or silver activator and R is at least one of europium and terbium.
Inventors
- 👤 Tatsuo Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:37
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/12; C03C3/00; C03C3/12; C03C3/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
A photoluminescent glass having the composition: [n{(1-x)M.sub.2 O.sup.. 2×Q.sup.. P.sub.2 O.sub.5 }][(1-y)Y.sub.2 O.sub.3.sup.. yR.sub.2 O.sub.3.sup.. 3P.sub.2 O.sub.5 ] wherein n is from 2 to 6; x is from 0 to 0.2 and y is from 0 to 1; and M is an alkali metal, Q is a thallium or silver activator selected from the group consisting of chlorides, oxides and nitrates of thallium and silver, R is at least one of the group consisting of europium and terbium; and wherein Q or R are present in said composition in amounts effective to achieve photoluminescence when said glass is subjected to excitation by ultraviolet light.
Claim 2
Dependent Claim
104 words
A photoluminescent glass having the composition: [n{(1-x)M.sub.2 O.sup.. 2×Q.sup.. P.sub.2 O.sub.5 }][(1-y)Y.sub.2 O.sub.3.sup.. yR.sub.2 O.sub.3.sup.. 3P.sub.2 O.sub.5 ] wherein n is from 2 to 6; x is from 0 to 0.2 and y is from 0 to 1; and M is an alkali metal, Q is a thallium or silver activator selected from the group consisting of chlorides, oxides and nitrates of thallium and silver, R is at least one of the group consisting of europium and terbium; and wherein Q or R are present in said composition in amounts effective to achieve photoluminescence when said glass is subjected to excitation by ultraviolet light.
Claim 3
Dependent Claim
25 words
A glass of claim 1, which is a green photoluminescent glass, having the composition: [n(M.sub.2 O.sup.. P.sub.2 O.sub.5)].sup.. [(1-y)Y.sub.2 O.sub.3.sup.. yTb.sub.2 O.sub.3.sup.. 3P.sub.2 O.sub.5 ]
Claim 4
Dependent Claim
26 words
A glass of claim 1, which is a red photoluminescent glass, having the composition: [n(M.sub.2 O.sup.. P.sub.2 O.sub.5)].sup.. [(1-y )Y.sub.2 O.sub.3.sup.. yEu.sub.2 O.sub.3.sup.. 3P.sub.2 O.sub.5 ]
Claim 5
Dependent Claim
25 words
A glass of claim 1, which is a blue photoluminescent glass, having the composition: [n{(1-x)M.sub.2 O.sup.. 2×TlCl.sup.. P.sub.2 O.sub.5 }].sup.. [Y.sub.2 O.sub.3.sup.. 3P.sub.2 O.sub.5 ]
Claim 6
Dependent Claim
32 words
A glass of claim 1, which is a blue photoluminescent glass, having the composition: [n{(1-x)M.sub.2 O.sup.. 2×AgCl.sup.. P.sub.2 O.sub.5 }][ Y.sub.2 O.sub.3.sup.. 3P.sub.2 O.sub.5 ] wherein x is from 0.01 to 0.05.
Claim 7
Dependent Claim
12 words
A glass of claim 1, wherein both europium and terbium are present.
Claim 8
Dependent Claim
62 words
The glass of claim 6, which is an orange photoluminescent glass, having the composition: [nM.sub.2 O.sup.. P.sub.2 O.sub.5 ][(1-y.sub.1)Y.sub.2 O.sub.3.sup.. y.sub.1 Tb.sub.2 O.sub.3.sup.. 3P.sub.2 O.sub.5 ][(1-y.sub.2)Y.sub.2 O.sub.3.sup.. y.sub.2 Eu.sub.2 O.sub.3.sup.. 3P.sub.2 O.sub.5 ] wherein y 1 +y 2 =y and the ratio of y 1 to y 2 is equal to or greater than 0.8 but less than or equal to 1.0.
Claim 9
Dependent Claim
62 words
The glass of claim 6, which is a yellow photoluminescent glass having the composition: [nM.sub.2 O.sup.. P.sub.2 O.sub.5 ][(1-y.sub.1)Y.sub.2 O.sub.3.sup.. y.sub.1 Tb.sub.2 O.sub.3.sup.. 3P.sub.2 O.sub.5 ][(1-y.sub.2)Y.sub.2 O.sub.3.sup.. y.sub.2 Eu.sub.2 O.sub.3.sup.. 3P.sub.2 O.sub.5 ] wherein y 1 +y 2 =y and the ratio of y 1 to y 2 is equal to or greater than 1.3 but less than or equal to 1.5.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |