US5159237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Green-light-emitting rare gas discharge lamp
Assignee: Mitsubishi Electric Corp
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Filing: 1991-05-01
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Granted: 1992-10-27
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Expires: 2011-05-01
Abstract
Abstract A green-light-emitting rare gas discharge lamp includes a glass tube filled with at least one selected from the group consisting of xenon, neon, helium, argon and krypton as a rare gas capable of emitting vacuum ultraviolet rays of a wavelength of not more than 200 nm, and includes on an inner surface of the glass tube a layer of a green-light-emitting phosphor having terbium-activated yttrium silicate, whereby it is intended to obtain enhanced performance as a green-light-emitting light source and to put the discharge lamp to practical use as a green-light-emitting light source for office automation equipment, for instance.
Inventors
- 👤 Kazutoshi Ishikawa
- 👤 Katsuo Murakami
- 👤 Seishiro Mitsuhashi
- 👤 Takashi Osawa
- 👤 Yujiro Kamano
- 👤 Yoshinori Anzai
- 👤 Takeo Saikatsu
- 👤 Hiromi Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:02
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/77742; C09K11/77744; H01J61/12; H01J61/16
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
85 words
A green-light-emitting rare gas discharge lamp comprising a glass tube filled with a rare gas capable of emitting vacuum ultraviolet rays of a wavelength of not more than 200 nm, and a layer of a phosphor provided on an inner surface of the glass tube, the phosphor emitting green light when irradiated with the vacuum ultraviolet rays, wherein; the rare gas comprises at least one selected from the group consisting of xenon, neon, helium, argon and krypton, and the green-light-emitting phosphor comprises terbium-activated yttrium silicate.
Claim 2
Dependent Claim
85 words
A green-light-emitting rare gas discharge lamp comprising a glass tube filled with a rare gas capable of emitting vacuum ultraviolet rays of a wavelength of not more than 200 nm, and a layer of a phosphor provided on an inner surface of the glass tube, the phosphor emitting green light when irradiated with the vacuum ultraviolet rays, wherein; the rare gas comprises at least one selected from the group consisting of xenon, neon, helium, argon and krypton, and the green-light-emitting phosphor comprises terbium-activated yttrium silicate.
Claim 3
Dependent Claim
42 words
A green-light-emitting rare gas discharge lamp as set forth in claim 1, wherein the green-light-emitting phosphor is a terbium-activated yttrium silicate phosphor comprising at least one element selected from the group consisting of boron, aluminum, phosphorus, scandium and the lanthanum series elements.
Claim 4
Dependent Claim
22 words
A green-light-emitting rare gas discharge lamp as set forth in claim 2, wherein the green-light-emitting phosphor is a terbium-activated yttrium scandium silicate.
Claim 5
Dependent Claim
22 words
A green-light-emitting rare gas discharge lamp as set forth in claim 2, wherein the green-light-emitting phosphor is a terbium-activated yttrium gadolinium silicate.
Claim 6
Dependent Claim
31 words
A green-light-emitting rare gas discharge lamp as set forth in claim 1, wherein a main peak in intensity of said emitted green light occurs at a wavelength of about 540 nm.
Claim 7
Dependent Claim
37 words
A green-light-emitting rare gas discharge lamp as set forth in claim 1, wherein the phosphor is essentially composed of terbium-activated yttrium silicate phosphor and the rate gas is a mixed gas essentially composed of neon and xenon.
Claim 8
Dependent Claim
39 words
A green-light-emitting rare gas discharge lamp as set forth in claim 1, wherein the phosphor is essentially composed of a terbium-activated yttrium scandium silicate phosphor and the rare gas is a mixed gas essentially composed of neon and xenon.
Claim 9
Dependent Claim
39 words
A green-light-emitting rare gas discharge lamp as set forth in claim 1, wherein the phosphor is essentially composed of a terbium-activated yttrium scandium silicate and the rare gas is a mixed gas essentially composed of neon, krypton and xenon.
Claim 10
Dependent Claim
39 words
A green-light-emitting rare gas discharge lamp as set forth in claim 1, wherein the phosphor is essentially composed of a terbium-activated yttrium scandium silicate and the rare gas is a mixed gas essentially composed of xenon, argon and helium.
Claim 11
Dependent Claim
38 words
A green-light-emitting rare gas discharge lamp as set forth in claim 1, wherein the phosphor is essentially composed of a terbium-activated yttrium gadolinium silicate and the rare gas is a mixed gas essentially composed of neon and xenon.
Claim 12
Dependent Claim
40 words
A green-light-emitting rare gas discharge lamp as set forth in claim 1, wherein the phosphor is essentially composed of a terbium-activated yttrium gadolinium silicate phosphor and the rare gas is a mixed gas essentially composed of xenon, argon and krypton.
Claim 13
Dependent Claim
53 words
A green-light-emitting rare gas discharge lamp as set forth in claim 1, wherein the phosphor is essentially composed of a terbium-activated yttrium silicate phosphor comprising at least one selected from the group consisting of boron, phosphorous, and aluminum and the rare gas is a mixed gas essentially composed of xenon, neon, and argon.
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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) | 1995-10-27 | 1996-04-27 | 1996-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-27 | 2000-04-27 | 2000-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-27 | 2004-04-27 | 2004-10-27 | $7700.00 | Window Closed / Lapsed |