US4967118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative glow discharge lamp
Assignee: Hitachi Ltd
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Filing: 1989-03-09
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Granted: 1990-10-30
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Expires: 2009-03-09
Abstract
Abstract A negative glow discharge lamp of small size comprising a cylindrical discharge container enclosing at least rare gas, a hot cathode disposed in the discharge container and coated with a thermion radiation matter, and an anode disposed in a negative glow domain formed between the anode and the hot cathode in the discharge container. In the discharge lamp, the outer diameter D (mm) of the discharge container is selected to satisfy the relation 3 W.sub.L <D<10 W.sub.L where W L the electric power consumption (W) of the discharge lamp when the length L (mm) of the discharge container lies within the range of L=25 to 100 mm.
Inventors
- 👤 Etsuo Urataki
- 👤 Masaroshi Kodama
- 👤 Hiromitsu Matsuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:31
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/64
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
A negative glow discharge lamp comprising a cylindrical discharge container enclosing at least rare gas, a hot cathode disposed in said discharge container and coated with a thermion radiation matter, and an anode disposed in a negative glow domain formed between said anode and said hot cathode in said discharge container, wherein the outer diameter D (mm) of said discharge container is selected to satisfy the relation 3 W.sub.L <D<10 W.sub.L where W L is the electric power consumption (W) of said discharge lamp when the length L (mm) of said discharge container lies within the range of L=25 to 100 mm.
Claim 2
Dependent Claim
102 words
A negative glow discharge lamp comprising a cylindrical discharge container enclosing at least rare gas, a hot cathode disposed in said discharge container and coated with a thermion radiation matter, and an anode disposed in a negative glow domain formed between said anode and said hot cathode in said discharge container, wherein the outer diameter D (mm) of said discharge container is selected to satisfy the relation 3 W.sub.L <D<10 W.sub.L where W L is the electric power consumption (W) of said discharge lamp when the length L (mm) of said discharge container lies within the range of L=25 to 100 mm.
Claim 3
Dependent Claim
33 words
A negative glow discharge lamp according to claim 1, wherein the distance L 1 (mm) between said anode and the base-side end of said discharge container is selected to satisfy the relation ##EQU5##
Claim 4
Dependent Claim
30 words
A negative glow discharge lamp according to claim 1, wherein a starting device is connected between said hot cathode and said anode for starting electric discharge in said discharge container.
Claim 5
Dependent Claim
30 words
A negative glow discharge lamp according to claim 2, wherein a starting device is connected between said hot cathode and said anode for starting electric discharge in said discharge container.
Claim 6
Dependent Claim
30 words
A negative glow discharge lamp according to claim 3, wherein a base is mounted on one end of said discharge container, and said starting device is built in said base.
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) | 1993-10-29 | 1994-04-30 | 1994-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-29 | 1998-04-30 | 1998-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-29 | 2002-04-30 | 2002-10-30 | $7700.00 | Window Closed / Lapsed |