US4150321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminescent aluminates and mercury vapor discharge lamp containing the same
Assignee: US Philips Corp
•
Filing: 1978-01-13
•
Granted: 1979-04-17
•
Expires: 1998-01-13
Abstract
Abstract Luminescent aluminate with magnetoplumbite crystal structure, activated by cerium, by cerium and terbium or by cerium and manganese. The aluminate comprises at least one of the elements B, Si and P in a quantity of 0.001 to 0.20 mole per mole of aluminate which results in improved properties of luminescence. These aluminates are preferably used in low-pressure mercury vapor discharge lamps.
Inventors
- 👤 Cornelis W. A. Schetters
- 👤 Marinus G. A. Tak
- 👤 Abraham Sonneveld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:19
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7774; C09K11/7715; C09K11/7721; C09K11/77744
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
192 words
A luminescent aluminate having a magnetoplumbite crystal structure and having a composition of either the formula La 1-p-q Ce p Tb q Me x Al 2y O 1 .5+x+3y ;zZ wherein Me is at least one element selected from the group consisting of Mg, Zn and Be, Z is at least one element selected from the group consisting of B, Si and P, up to 25 mol % of Al being replaceable by Ga and/or Sc and wherein 0 ≦ x ≦ 2 5 ≦ y ≦ 15 0.001 ≦ Z ≦ 0.20 0.005 ≦ p ≦ 0.90 0 ≦ q ≦ 0.60 or the formula A 1-p Ce p Me p Al 12-p O 19 ;zZ, wherein A is at least one element selected from the group consisting of Sr and Ca, Me is at least one element selected from the group consisting of Mg, Zn and Be, and Z is at least one element selected from the group consisting of B, Si and P, wherein up to 25 mole % of Al being replaceable by Ga and/or Sc and wherein 0.005 ≦ p ≦ 0.25 0.001 ≦ z ≦ 0.20.
Claim 2
Dependent Claim
192 words
A luminescent aluminate having a magnetoplumbite crystal structure and having a composition of either the formula La 1-p-q Ce p Tb q Me x Al 2y O 1 .5+x+3y ;zZ wherein Me is at least one element selected from the group consisting of Mg, Zn and Be, Z is at least one element selected from the group consisting of B, Si and P, up to 25 mol % of Al being replaceable by Ga and/or Sc and wherein 0 ≦ x ≦ 2 5 ≦ y ≦ 15 0.001 ≦ Z ≦ 0.20 0.005 ≦ p ≦ 0.90 0 ≦ q ≦ 0.60 or the formula A 1-p Ce p Me p Al 12-p O 19 ;zZ, wherein A is at least one element selected from the group consisting of Sr and Ca, Me is at least one element selected from the group consisting of Mg, Zn and Be, and Z is at least one element selected from the group consisting of B, Si and P, wherein up to 25 mole % of Al being replaceable by Ga and/or Sc and wherein 0.005 ≦ p ≦ 0.25 0.001 ≦ z ≦ 0.20.
Claim 3
Dependent Claim
32 words
The luminescent aluminate of claim 1 wherein in the first formula Me is Mg and p+q=1, 1 ≦ x ≦ 2, 5.5 ≦ y ≦ 11 and 0.10 ≦ p ≦ 0.80.
Claim 4
Dependent Claim
18 words
A luminescent aluminate of claim 1 wherein in the second formula A is Sr and Me is Mg.
Claim 5
Dependent Claim
33 words
A low pressure mercury vapor discharge lamp comprising an envelope, two electrodes at opposite ends of said envelope, and a luminescent aluminate of claim 1 disposed on the inner surface of said envelope.
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) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |