US4112328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Barium magnesium fluoride phosphors and lamps and X-ray screens embodying same
Assignee: GTE Sylvania Inc
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Filing: 1977-01-27
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Granted: 1978-09-05
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Expires: 1997-01-27
Abstract
Abstract Two new barium magnesium fluorides, Ba 2 Mg 3 F 10 and BaMg 3 F 8 , can be prepared by solid state reactions of barium fluoride and magnesium fluoride by heating in controlled atmospheric conditions at a temperature from about 700° C to about 850° C. In the BaF 2 -MgF 2 binary system, compositions containing from about 40 to 85 mole percent of MgF 2 when activated by europium alone or in combination with manganese have been found to luminesce when excited by ultraviolet light, cathode rays, or with x-ray bombardment. Lamps incorporating these materials afford benefits of high temperature stability and x-ray intensifying screens incorporating these materials yield a speed equal to or better than present screens employing calcium tungstate.
Inventors
- 👤 Robert W. Wolfe
- 👤 Russell F. Messier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:48
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/7732; C09K11/7733
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
A luminescent composition comprising a host selected from the group consisting of barium magnesium fluoride compounds and mixtures of barium fluoride and magnesium fluoride, wherein the MgF 2 content of said host is from about 40 to about 85 mole percent and the BaF 2 content is from about 15 to about 60 mole percent and, as an activator, from about 0.01 to about 0.2 moles EuF 2 per mole of host, and from 0 to about 0.3 moles MnF 2 per mole of host.
Claim 2
Dependent Claim
85 words
A luminescent composition comprising a host selected from the group consisting of barium magnesium fluoride compounds and mixtures of barium fluoride and magnesium fluoride, wherein the MgF 2 content of said host is from about 40 to about 85 mole percent and the BaF 2 content is from about 15 to about 60 mole percent and, as an activator, from about 0.01 to about 0.2 moles EuF 2 per mole of host, and from 0 to about 0.3 moles MnF 2 per mole of host.
Claim 3
Dependent Claim
23 words
A composition according to claim 1 wherein said MgF 2 content is from about 50 to about 75 mole percent of the host.
Claim 4
Dependent Claim
26 words
A composition according to claim 1 wherein said EuF 2 content is from about 0.02 to about 0.15 moles of EuF 2 per mole of host.
Claim 5
Dependent Claim
22 words
A composition according to claim 1 wherein said MnF 2 content is from 0 to about 0.25 moles per mole of host.
Claim 6
Dependent Claim
107 words
An x-ray intensifying screen comprising: a. a base of a material transparent to x-rays, b. a coating on said base of a luminescent composition comprising a host selected from the group consisting of barium magnesium fluoride compounds and mixtures of barium fluoride and magnesium fluoride, wherein the MgF 2 content of said host is from about 40 to about 85 mole percent and the BaF 2 content is from about 15 to about 60 mole percent and, as an activator, from about 0.01 to about 0.2 moles EuF 2 per mole of host and c. a visible light transparent protective coating over said coating of luminescent material.
Claim 7
Dependent Claim
107 words
An x-ray intensifying screen comprising: a. a base of a material transparent to x-rays, b. a coating on said base of a luminescent composition comprising a host selected from the group consisting of barium magnesium fluoride compounds and mixtures of barium fluoride and magnesium fluoride, wherein the MgF 2 content of said host is from about 40 to about 85 mole percent and the BaF 2 content is from about 15 to about 60 mole percent and, as an activator, from about 0.01 to about 0.2 moles EuF 2 per mole of host and c. a visible light transparent protective coating over said coating of luminescent material.
Claim 8
Dependent Claim
24 words
An x-ray screen according to claim 5 wherein said MgF 2 content is from about 50 to about 75 mole percent of the host.
Claim 9
Dependent Claim
140 words
A mercury discharge lamp comprising: a. an ultraviolet light transparent inner envelope, b. a fill of mercury inside said envelope, c. a pair of electrodes sealed at opposing ends of said envelope, d. an outer visible light transparent envelope encompassing said inner envelope, and e. a coating on the inner surface of said envelope of a luminescent composition comprising a host selected from the group consisting of barium magnesium fluoride compounds and mixtures of barium fluoride and magnesium fluoride, wherein the MgF 2 content of said host is from about 40 to about 85 mole percent and the BaF 2 content is from about 15 to about 60 mole percent and, as an activator, from about 0.01 to about 0.2 moles EuF 2 per mole of host, and from 0 to about 0.3 moles MnF 2 per mole of host.
Claim 10
Dependent Claim
140 words
A mercury discharge lamp comprising: a. an ultraviolet light transparent inner envelope, b. a fill of mercury inside said envelope, c. a pair of electrodes sealed at opposing ends of said envelope, d. an outer visible light transparent envelope encompassing said inner envelope, and e. a coating on the inner surface of said envelope of a luminescent composition comprising a host selected from the group consisting of barium magnesium fluoride compounds and mixtures of barium fluoride and magnesium fluoride, wherein the MgF 2 content of said host is from about 40 to about 85 mole percent and the BaF 2 content is from about 15 to about 60 mole percent and, as an activator, from about 0.01 to about 0.2 moles EuF 2 per mole of host, and from 0 to about 0.3 moles MnF 2 per mole of host.
Claim 11
Dependent Claim
23 words
A lamp according to claim 7 wherein said MgF 2 content is from about 50 to about 75 mole percent of the host.
Claim 12
Dependent Claim
24 words
A lamp according to claim 7 wherein said MnF 2 content is from 0 to about 0.25 moles MnF 2 per mole of host.
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) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |