US4320322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode geometry to improve arc stability
Assignee: Osram Sylvania Inc
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Filing: 1980-03-24
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Granted: 1982-03-16
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Expires: 2000-03-24
Abstract
Abstract A high intensity discharge device operable in any orientation employs electrodes whose major portions are parallel and whose minor portions converge toward each other. The converging minor portions can be loops of electrode material.
Inventors
- 👤 Harold L. Rothwell, Jr.
- 👤 William M. Keeffe
- 👤 W. Calvin Gungle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:14
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
88 words
A high intensity arc discharge device having a transparent body including an arc chamber containing an arc generating and sustaining medium and a pair of electrodes sealed in said body and extending into said arc chamber, said electrodes having major portions and minor portions, said major portions of said electrodes being substantially parallel with respect to each other and said minor portions being formed as substantially circular loops at least partially convergent toward each other, a stable arc region existing primarily between said convergent portions of said loops.
Claim 2
Dependent Claim
88 words
A high intensity arc discharge device having a transparent body including an arc chamber containing an arc generating and sustaining medium and a pair of electrodes sealed in said body and extending into said arc chamber, said electrodes having major portions and minor portions, said major portions of said electrodes being substantially parallel with respect to each other and said minor portions being formed as substantially circular loops at least partially convergent toward each other, a stable arc region existing primarily between said convergent portions of said loops.
Claim 3
Dependent Claim
19 words
The device of claim 1 wherein said major portions of said electrodes comprise two strands of material twisted together.
Claim 4
Dependent Claim
18 words
The device of claim 2 wherein said loops converge toward each other at an angle of about 45°.
References Cited (Backward Citations)
US1279415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |