US4810930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminescent Eu3+ -activated silicate, luminescent screen provided with such a silicate and low-pressure mercury vapor discharge lamp provided with such a screen
Assignee: US Philips Corp
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Filing: 1988-07-29
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Granted: 1989-03-07
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Expires: 2008-07-29
Abstract
Abstract Luminescent Eu 3+ -activated alkaline earth metal-rare earth metal silicate, which is defined by the formula Ba 2 Gd 2-x-y Y x Eu y Si 4-z Ge z O 13 , in which O≦x≦1.3, 0.01≦y≦1.0 and O≦z≦4, luminescent screen provided with such a silicate and low-pressure mercury vapor discharge lamp provided with such a screen.
Inventors
- 👤 Johannus G. Verlijsdonk
- 👤 Bruno M. J. Smets
- 👤 Joseph Rutten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:07
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7793; C09K11/77922; H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
34 words
A luminescent Eu 3+ -activated alkaline earth metal-rare earth metal silicate, characterized in that the silicate is defined by the formula Ba.sub.2 Gd.sub.2-x-y Y.sub.x Eu.sub.y Si.sub.4-z Ge.sub.z O.sub.13, in which 0≦x≦1.3, 0.01≦y≦1.0 and 0≦z≦4.
Claim 2
Dependent Claim
34 words
A luminescent Eu 3+ -activated alkaline earth metal-rare earth metal silicate, characterized in that the silicate is defined by the formula Ba.sub.2 Gd.sub.2-x-y Y.sub.x Eu.sub.y Si.sub.4-z Ge.sub.z O.sub.13, in which 0≦x≦1.3, 0.01≦y≦1.0 and 0≦z≦4.
Claim 3
Dependent Claim
12 words
A luminescent silicate as claimed in claim 1, characterized in that 0.1≦y≦0.5.
Claim 4
Dependent Claim
12 words
A luminescent silicate as claimed in claim 2, characterized in that 1.5≦z≦2.5.
Claim 5
Dependent Claim
12 words
A luminescent silicate as claimed in claim 2, characterized in that 0.5≦x≦1.
Claim 6
Dependent Claim
12 words
A luminescent silicate as claimed in claim 1, characterized in that 1.5≦z≦2.5.
Claim 7
Dependent Claim
12 words
A luminescent silicate as claimed in claim 5, characterized in that 0.5≦x≦1.
Claim 8
Dependent Claim
12 words
A luminescent silicate as claimed in claim 1, characterized in that 0.5≦x≦1.
Claim 9
Dependent Claim
15 words
A luminescent screen comprising a luminescent silicate as claimed in claim 1 on a support.
Claim 10
Dependent Claim
16 words
A low-pressure mercury vapour discharge lamp provided with a luminescent screen as claimed in claim 8.
References Cited (Backward Citations)
US3400081A
Cited
US3523091A
Cited
US3650974A
Cited
US3897359A
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US4128498A
Cited
US4315191A
Cited
US4354139A
Cited
US4748391A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |