US4013914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
electrode protecting means for electric discharge lamps
Assignee: Philips North America LLC
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Filing: 1975-11-26
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Granted: 1977-03-22
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Expires: 1995-11-26
Abstract
Abstract A fluorescent lamp having two opposite electrodes, wire probes located near the electrodes for collecting electrons during the positive half-cycle on an electrode, and a coating of a dielectric material, such as boron nitride, on each probe for storing some collected electrons and attracting a part of positive ions during the negative half-cycle.
Inventors
- 👤 James P. Clune
- 👤 Harry W. Aptt
- 👤 Sebastian J. Marci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:26
CPC Classifications
H; H01; H01J; H01J3/00; H01J3/40; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/067
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
74 words
A discharge tube comprising two electrodes, at least one wire probe electrically connected to each electrode and mounted in proximity thereto to act as a collector of electrons during a positive half-cycle on an electrode and, on each wire probe, a coating of a dielectric material having very low electron leakage to store some of the collected electrons and to attract during a negative half-cycle a part of positive ions impinging upon the electrode.
Claim 2
Dependent Claim
74 words
A discharge tube comprising two electrodes, at least one wire probe electrically connected to each electrode and mounted in proximity thereto to act as a collector of electrons during a positive half-cycle on an electrode and, on each wire probe, a coating of a dielectric material having very low electron leakage to store some of the collected electrons and to attract during a negative half-cycle a part of positive ions impinging upon the electrode.
Claim 3
Dependent Claim
14 words
A discharge tube as claimed in claim 1, wherein said coating is boron nitride.
References Cited (Backward Citations)
US2300997A
Cited
US2824255A
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US3005930A
Cited
US2946909A
Cited
US3215882A
Cited
US3898503A
Cited
US3914637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |