Patent US2727074A successfully refreshed from Google Patents.
US4151443A
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US
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Luminescent materials and discharge lamp containing the same
Assignee: US Philips Corp
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Filing: 1978-08-24
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Granted: 1979-04-24
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Expires: 1998-08-24
Abstract
Abstract A luminescent material having the eulytine crystal structure and a composition defined by Ca 3-x-y-p Me x Sn p Ln 1+y-q-r A q Sb r (PO 4 ) 3-y (SiO 4 ) y , wherein Me is Sr and/or Ba, Ln is Y, La, Gd and/or Lu, and A is Ce and/or Tb and wherein 0≦x≦2.5, 0≦y≦0.5, 0≦P≦0.2, x+y+p≦2.5, 0≦q≦1+y-r, 0≦r≦0.5, p+q+r≠0.
Inventors
- 👤 Petrus F. J. VAN DEN Boom
- 👤 Antonius M. J. H. Seuter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:55
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7777; C09K11/7778; C09K11/7709; C09K11/771
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
A luminescent material having the eulytine crystal structure, characterized in that the luminescent material has a composition defined by the formula Ca 3-x-y-p Me x Sn p Ln 1+y-q-r A q Sb r (PO 4 ) 3-y (SiO 4 ) y , wherein Me represents Sr and/or Ba, Ln at least one of the elements Y, La, Gd and Lu, and A represents Ce and/or Tb, wherein 0≦x≦2.5 0≦y≦0.5 0≦p≦0.2 x+y+p≦2.5 0≦q≦1+y-r 0≦r≦0.5 p+q+r≠0 and wherein Sn when present being in the divalent state; Sb when present being in the trivalent state, and Ce when present being in the trivalent state.
Claim 2
Dependent Claim
101 words
A luminescent material having the eulytine crystal structure, characterized in that the luminescent material has a composition defined by the formula Ca 3-x-y-p Me x Sn p Ln 1+y-q-r A q Sb r (PO 4 ) 3-y (SiO 4 ) y , wherein Me represents Sr and/or Ba, Ln at least one of the elements Y, La, Gd and Lu, and A represents Ce and/or Tb, wherein 0≦x≦2.5 0≦y≦0.5 0≦p≦0.2 x+y+p≦2.5 0≦q≦1+y-r 0≦r≦0.5 p+q+r≠0 and wherein Sn when present being in the divalent state; Sb when present being in the trivalent state, and Ce when present being in the trivalent state.
Claim 3
Dependent Claim
46 words
A luminescent material as claimed in claim 1, wherein x, p, r and y are zero and characterized in that the luminescent material has a composition defined by the formula Ca 3 Ln 1-s-t Ce s Tb t (PO 4 ) 3 , wherein 0.5≦s+t≦1 1≦t/s≦3
Claim 4
Dependent Claim
36 words
A low-pressure mercury vapor discharge lamp comprising a discharge tube, electrodes disposed at each end of the tube, mercury contained therein and the luminescent material of claim 1 coated on the inner side of said tube.
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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) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |